Car part

Engine coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) 75 hp Diesel

Manufacturer
More
Prestone PAFR83311
Article №: PAFR83311
Antifreeze Prestone COR GUARD PAFR83311 G12, yellow, 1l, Ready mixed, Free of silicate
Details
  • Temperature range from [°C]: -37
  • Specification: G12
  • Capacity [litre]: 1
  • Product line: COR GUARD
  • Properties: Ready mixed
  • Colour: yellow
  • Coolant manufacturer recommendation: G11, G12, G12+, G12++, G12evo, G13, universal
  • Packing Type: Canister
  • Operating temperature to [C°]: +129
  • Observe technical data: +
  • Chemical Properties: Free of silicate
  • Condition: New
More
£ 5,43
£ 5,43 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37382
Article №: 37382
Antifreeze KROON OIL Coolant, SP 15+ 37382 Orange, 1l, Concentrate, Borate free-Free of silicate
Details
  • Manufacturer recommendations: MAT 3624, MAT 3724, DAF 74002, DDC DFS 93 K217, DQC CB-14, Ford WSS-M97B44-D, GMW 3420, Komatsu 07.892, STJLR.03.5212, MAN 324 SNF, MB 325.3, Volvo VCS-2
  • Capacity [litre]: 1
  • Colour: Orange
  • Properties: Concentrate
  • Product line: Coolant
  • Version: SP 15+
  • Chemical Properties: Free of silicate, Free of nitrite, Borate free
  • Packing Type: Bottle
  • Vehicle type: Car
  • Mixing Ratio: -18 °C(67/33), -24 °C(60/40), -38 °C(50/50)
  • Condition: New
More
£ 6,49
£ 6,49 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37338 Coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2023 price
KROON OIL 37338
Article №: 37338
Antifreeze KROON OIL Coolant, SP 14+ 37338 ASTM D3306-JIS K 2234, green, 1l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Fiat 9.55523, Ford WSS-M97B57-A2, MB 326.7, PSA B71 1111, Renault 41-01-001-V
  • Capacity [litre]: 1
  • Properties: Ready mixed
  • Colour: green
  • Specification: ASTM D3306, ASTM D6210, JIS K 2234
  • Product line: Coolant
  • Version: SP 14+
  • Chemical Properties: Free of silicate
  • Packing Type: Bottle
  • Ambient temperature from [°C]: -37
  • Vehicle type: Car
  • Condition: New
More
£ 6,99
£ 6,99 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37380 Engine coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2022 price
KROON OIL 37380
Article №: 37380
Antifreeze KROON OIL Antifreeze, SP 15+ 37380 Orange, 1l, Concentrate, Borate free-Free of silicate
Details
  • Manufacturer recommendations: MAT 3624, MAT 3724, DAF 74002, DDC DFS 93 K217, DQC CB-14, GMW 3420, Komatsu 07.892, STJLR.03.5212, MAN 324 SNF, MB 325.3, Volvo VCS-2
  • Capacity [litre]: 1
  • Colour: Orange
  • Properties: Concentrate
  • Product line: Antifreeze
  • Version: SP 15+
  • Chemical Properties: Free of silicate, Free of nitrite, Borate free
  • Packing Type: Bottle
  • Vehicle type: Car
  • Mixing Ratio: -18 °C(67/33), -24 °C(60/40), -38 °C(50/50)
  • Condition: New
More
£ 7,99
£ 7,99 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37346 Antifreeze MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2021 price
+ 2
KROON OIL 37346
Article №: 37346
Antifreeze KROON OIL Antifreeze, SP 14+ 37346 ASTM D3306-JIS K 2234, green, 1l, Concentrate, Free of silicate
Details
  • Manufacturer recommendations: Fiat 9.55523, Ford WSS-M97B57-A2, MB 325.7, Renault 41-01-001-V, PSA B71 1111
  • Capacity [litre]: 1
  • Properties: Concentrate
  • Colour: green
  • Specification: ASTM D3306, ASTM D6210, JIS K 2234
  • Version: SP 14+
  • Product line: Antifreeze
  • Chemical Properties: Free of silicate
  • Packing Type: Bottle
  • Vehicle type: Car
  • Condition: New
More
£ 9,49
£ 9,49 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
Prestone PAFR83328 Anti-freeze Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp OM608.915(K9K)
Article №: PAFR83328
Antifreeze Prestone COR GUARD PAFR83328 G12-G12++, yellow, 4l, Ready mixed, Free of silicate
Details
  • Capacity [litre]: 4
  • Specification: G12, G12++, G12+
  • Product line: COR GUARD
  • Colour: yellow
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: G11, G12, G12+, G12++, G12evo, G13, universal
  • Packing Type: Canister
  • Operating temperature to [C°]: +129
  • Operating temperature from [°C]: -37
  • Observe technical data: +
  • Chemical Properties: Free of silicate
  • Condition: New
More
£ 13,21
£ 3,30 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37383 Engine coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2024 price
KROON OIL 37383 Engine coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp OM608.915(K9K)
Article №: 37383
Antifreeze KROON OIL Coolant, SP 15+ 37383 Orange, 5l, Concentrate, Borate free-Free of silicate
Details
  • Manufacturer recommendations: MAT 3624, MAT 3724, DAF 74002, DDC DFS 93 K217, DQC CB-14, Ford WSS-M97B44-D, GMW 3420, Komatsu 07.892, STJLR.03.5212, MAN 324 SNF, MB 325.3, Volvo VCS-2
  • Capacity [litre]: 5
  • Colour: Orange
  • Properties: Concentrate
  • Version: SP 15+
  • Product line: Coolant
  • Chemical Properties: Free of silicate, Free of nitrite, Borate free
  • Packing Type: Canister
  • Vehicle type: Car
  • Mixing Ratio: -18 °C(67/33), -24 °C(60/40), -38 °C(50/50)
  • Condition: New
More
£ 20,99
£ 4,20 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
KROON OIL 37339 Antifreeze Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2023 price
KROON OIL 37339 Antifreeze Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp OM608.915(K9K)
Article №: 37339
Antifreeze KROON OIL Coolant, SP 14+ 37339 ASTM D3306-JIS K 2234, green, 5l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Fiat 9.55523, Ford WSS-M97B57-A2, MB 326.7, Renault 41-01-001-V
  • Capacity [litre]: 5
  • Properties: Ready mixed
  • Colour: green
  • Specification: ASTM D3306, ASTM D6210, JIS K 2234
  • Product line: Coolant
  • Version: SP 14+
  • Chemical Properties: Free of silicate
  • Packing Type: Canister
  • Ambient temperature from [°C]: -37
  • Vehicle type: Car
  • Condition: New
More
£ 22,49
£ 4,50 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MPM 86005CRN Coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2022 price
MPM 86005CRN Coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp OM608.915(K9K)
Article №: 86005CRN
Antifreeze MPM Premium Synthetic, Nissan/Renault 86005CRN ASTM D3306-ASTM D6210, yellow, 5l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Ford WSS-M97B57-A1, MB 326.7, Nissan L248, Nissan L250, Renault Coolant D, Toyota TSK 2601G-8A
  • Capacity [litre]: 5
  • Colour: yellow
  • Properties: Ready mixed
  • Product line: Premium Synthetic
  • Version: Nissan/Renault
  • Specification: ASTM D3306, ASTM D6210
  • Fill quantity [l]: 10
  • Chemical Properties: Free of silicate
  • Packing Type: Canister
  • Vehicle type: Car
  • Ambient temperature from [°C]: -40
  • Condition: New
More
£ 45,99
£ 9,20 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MPM 86020CRN Engine coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2021 price
MPM 86020CRN Radiator coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp OM608.915(K9K)
Article №: 86020CRN
Antifreeze MPM Premium Synthetic, Nissan/Renault 86020CRN ASTM D3306-ASTM D6210, yellow, 20l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Ford WSS-M97B57-A1, MB 326.7, Nissan L248, Nissan L250, Renault Coolant D, Toyota TSK 2601G-8A
  • Capacity [litre]: 20
  • Colour: yellow
  • Properties: Ready mixed
  • Product line: Premium Synthetic
  • Version: Nissan/Renault
  • Specification: ASTM D3306, ASTM D6210
  • Fill quantity [l]: 10
  • Chemical Properties: Free of silicate
  • Packing Type: Canister
  • Vehicle type: Car
  • Ambient temperature from [°C]: -40
  • Condition: New
More
£ 162,99
£ 8,15 for 1 litre
incl. 20% VAT, free delivery
Free delivery
In stock
Warning!
More
Details
MA PROFESSIONAL Car radiator fluid 61-103 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 61-103
Antifreeze MA PROFESSIONAL Car radiator fluid 61-103 blue, 1l, Ready mixed
Details
  • Product line: Car radiator fluid
  • Colour: blue
  • Capacity [litre]: 1
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: other
  • Operating temperature to [C°]: -35
  • Packing Type: Bottle
  • Observe technical data: +
  • Condition: New
More
£ 2,99
£ 2,99 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MA PROFESSIONAL 61-001 Coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2024 price
MA PROFESSIONAL Radigard, Long Life 61-001 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 61-001
Antifreeze MA PROFESSIONAL Radigard, Long Life 61-001 green, 1l, Ready mixed, high corrosion protection
Details
  • Capacity [litre]: 1
  • Colour: green
  • Properties: Ready mixed
  • Product line: Radigard
  • Version: Long Life
  • Packing Type: Bottle
  • Ambient temperature from [°C]: -35
  • Chemical Properties: high corrosion protection
  • Consistency (property): Thin
  • Condition: New
More
£ 3,49
£ 3,49 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MA PROFESSIONAL Coolant concentrate 61-106 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 61-106
Antifreeze MA PROFESSIONAL Coolant concentrate 61-106 blue, 1l, Concentrate
Details
  • Product line: Coolant concentrate
  • Colour: blue
  • Capacity [litre]: 1
  • Properties: Concentrate
  • Coolant manufacturer recommendation: other
  • Packing Type: Bottle
  • Operating temperature to [C°]: -35
  • Observe technical data: +
  • Condition: New
More
£ 4,49
£ 4,49 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MA PROFESSIONAL Car radiator fluid 61-102 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 61-102
Antifreeze MA PROFESSIONAL Car radiator fluid 61-102 blue, 5l, Ready mixed
Details
  • Product line: Car radiator fluid
  • Colour: blue
  • Capacity [litre]: 5
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: other
  • Packing Type: Canister
  • Operating temperature to [C°]: -35
  • Observe technical data: +
  • Condition: New
More
£ 8,99
£ 1,80 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
MA PROFESSIONAL Coolant concentrate 61-109 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 61-109
Antifreeze MA PROFESSIONAL Coolant concentrate 61-109 blue, 5l, Concentrate
Details
  • Product line: Coolant concentrate
  • Colour: blue
  • Capacity [litre]: 5
  • Properties: Concentrate
  • Coolant manufacturer recommendation: other
  • Packing Type: Canister
  • Operating temperature to [C°]: -35
  • Observe technical data: +
  • Condition: New
More
£ 12,99
£ 2,60 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
Michelin Expert 009214 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 009214
Antifreeze Michelin Expert 009214 yellow, 4l, Ready mixed
Details
  • Temperature range from [°C]: +107
  • Capacity [litre]: 4
  • Version: Expert
  • Colour: yellow
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: other
  • Universal: Yes
  • Packing Type: Canister
  • Temperature range to [°C]: -35
  • Recommended change interval [km]: 150 000
  • Condition: New
More
£ 24,99
£ 6,25 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Warning!
More
Details
Prestone PAFR0057B Antifreeze MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2024 price
+ 2
Prestone PAFR0057B for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: PAFR0057B
Antifreeze Prestone PAFR0057B yellow, 1l, Ready mixed
Details
  • Temperature range from [°C]: -37
  • Capacity [litre]: 1
  • Colour: yellow
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: other
  • Ready to use
  • Temperature range to [°C]: +129
  • Condition: New
More
£ 8,99
£ 8,99 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Details
Prestone PAFR0058B Coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2023 price
+ 2
Prestone PAFR0058B for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: PAFR0058B
Antifreeze Prestone PAFR0058B yellow, 1l, Concentrate
Details
  • Temperature range from [°C]: -37
  • Capacity [litre]: 1
  • Concentrate
  • Colour: yellow
  • Properties: Concentrate
  • Coolant manufacturer recommendation: other
  • Temperature range to [°C]: +129
  • Condition: New
More
£ 11,49
£ 11,49 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Danger!
More
Details
Prestone PAFR0059B Engine coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2022 price
+ 2
Prestone PAFR0059B for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: PAFR0059B
Antifreeze Prestone PAFR0059B yellow, 4l, Concentrate
Details
  • Temperature range from [°C]: -37
  • Capacity [litre]: 4
  • Concentrate
  • Colour: yellow
  • Properties: Concentrate
  • Coolant manufacturer recommendation: other
  • Temperature range to [°C]: +129
  • Condition: New
More
£ 36,49
£ 9,12 for 1 litre
incl. 20% VAT, excl. delivery costs
In stock
Danger!
More
Details
Prestone PAFR0060B Antifreeze Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2021 price
+ 2
Prestone PAFR0060B for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: PAFR0060B
Antifreeze Prestone PAFR0060B yellow, 20l, Concentrate
Details
  • Temperature range from [°C]: -37
  • Capacity [litre]: 20
  • Concentrate
  • Colour: yellow
  • Properties: Concentrate
  • Coolant manufacturer recommendation: other
  • Temperature range to [°C]: +129
  • Condition: New
More
£ 244,49
£ 12,22 for 1 litre
incl. 20% VAT, free delivery
Free delivery
In stock
Danger!
More
Details
MPM 86001CRN Coolant MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2025 price
MPM Premium Synthetic, Nissan/Renault 86001CRN for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 86001CRN
Antifreeze MPM Premium Synthetic, Nissan/Renault 86001CRN ASTM D3306-ASTM D6210, yellow, 1l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Ford WSS-M97B57-A1, MB 326.7, Nissan L248, Nissan L250, Renault Coolant D, Toyota TSK 2601G-8A
  • Capacity [litre]: 1
  • Colour: yellow
  • Properties: Ready mixed
  • Product line: Premium Synthetic
  • Version: Nissan/Renault
  • Specification: ASTM D3306, ASTM D6210
  • Fill quantity [l]: 10
  • Chemical Properties: Free of silicate
  • Packing Type: Bottle
  • Vehicle type: Car
  • Ambient temperature from [°C]: -40
  • Condition: New
More
£ 14,99
£ 14,99 for 1 litre
incl. 20% VAT, excl. delivery costs
Not in stock
Warning!
More
Details
KROON OIL Coolant, SP 15+ 37384 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 37384
Antifreeze KROON OIL Coolant, SP 15+ 37384 Orange, 20l, Concentrate, Borate free-Free of silicate
Details
  • Manufacturer recommendations: MAT 3624, MAT 3724, DAF 74002, DDC DFS 93 K217, DQC CB-14, Ford WSS-M97B44-D, GMW 3420, Komatsu 07.892, STJLR.03.5212, MAN 324 SNF, MB 325.3, Volvo VCS-2
  • Capacity [litre]: 20
  • Colour: Orange
  • Properties: Concentrate
  • Version: SP 15+
  • Product line: Coolant
  • Chemical Properties: Free of silicate, Free of nitrite, Borate free
  • Packing Type: Canister
  • Vehicle type: Car
  • Mixing Ratio: -18 °C(67/33), -24 °C(60/40), -38 °C(50/50)
  • Condition: New
More
£ 55,49
£ 2,77 for 1 litre
incl. 20% VAT, excl. delivery costs
Not in stock
Warning!
More
Details
KROON OIL 37340 Antifreeze MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2023 price
+ 2
KROON OIL Coolant, SP 14+ 37340 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 37340
Antifreeze KROON OIL Coolant, SP 14+ 37340 ASTM D3306-JIS K 2234, green, 20l, Ready mixed, Free of silicate
Details
  • Manufacturer recommendations: Fiat 9.55523, Ford WSS-M97B57-A2, MB 326.7, Renault 41-01-001-V
  • Capacity [litre]: 20
  • Properties: Ready mixed
  • Colour: green
  • Specification: ASTM D3306, ASTM D6210, JIS K 2234
  • Product line: Coolant
  • Version: SP 14+
  • Chemical Properties: Free of silicate
  • Packing Type: Canister
  • Ambient temperature from [°C]: -37
  • Vehicle type: Car
  • Condition: New
More
£ 68,99
£ 3,45 for 1 litre
incl. 20% VAT, excl. delivery costs
Not in stock
Warning!
More
Details
KROON OIL 37347 Coolant Citan II Tourer (W420) 108 CDI (420.713) Diesel 75 hp 2022 price
+ 2
KROON OIL Antifreeze, SP 14+ 37347 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 37347
Antifreeze KROON OIL Antifreeze, SP 14+ 37347 ASTM D3306-JIS K 2234, green, 20l, Concentrate, Free of silicate
Details
  • Manufacturer recommendations: Fiat 9.55523, Ford WSS-M97B57-A2, MB 325.7, Renault 41-01-001-V, PSA B71 1111
  • Capacity [litre]: 20
  • Properties: Concentrate
  • Colour: green
  • Specification: ASTM D3306, ASTM D6210, JIS K 2234
  • Version: SP 14+
  • Product line: Antifreeze
  • Chemical Properties: Free of silicate
  • Packing Type: Canister
  • Vehicle type: Car
  • Condition: New
More
£ 114,49
£ 5,72 for 1 litre
incl. 20% VAT, excl. delivery costs
Not in stock
Warning!
More
Details
Michelin Expert 009215 for Citan II Tourer W420 108CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
Article №: 009215
Antifreeze Michelin Expert 009215 G13, yellow, 1,5l, Ready mixed
Details
  • Temperature range from [°C]: +107
  • Capacity [litre]: 1,5
  • Version: Expert
  • Colour: yellow
  • Specification: G13
  • Properties: Ready mixed
  • Coolant manufacturer recommendation: other
  • Universal: Yes
  • Packing Type: Canister
  • Temperature range to [°C]: -35
  • Recommended change interval [km]: 150 000
  • Condition: New
More
£ 12,49
£ 8,33 for 1 litre
incl. 20% VAT, excl. delivery costs
Not in stock
Warning!
More
Details

Showing 25 out of 49 products

  • Pay with PayPal Antifreeze MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) OM 608.915 (K9K) (55 kW)
  • Pay with Visa Coolant MERCEDES-BENZ Citan II Tourer (W420) 108CDI (420.713) OM608.915(K9K) (75 hp / 55 kW)
  • Pay with Mastercard MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) OM 608.915 (K9K) 75 hp Coolant
  • Pay with Discover MERCEDES-BENZ Citan II Tourer (W420) 108 CDI (420.713) OM608.915(K9K) 75 hp Diesel Radiator coolant
  • Pay with American Express Radiator coolant Mercedes Citan II Tourer (W420) 108 CDI (420.713) OM 608.915 (K9K) 55 kW Diesel
  • Pay with Bank Transfer MB Citan II Tourer (W420) 108 CDI (420.713) 75 hp Radiator fluid