Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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2021 BMW Z4 sDrive M40i
Quick Lookups: Fluids
2021 BMW Z4 sDrive M40iSECTION Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Refrigerant | 1.22 LBS. | 0.55 KG | R-134a Part No. 83 19 9 408 386. R1234yf Part No. 83 19 2 354 790 | The nameplate in the engine compartment indicates which refrigerant has been used. | S | ||
| Automatic Transmission Fluid | 3.0L Eng | 9.88 QTS. | 9.34 L | Automatic Transmission Fluid 3 and Automatic Transmission 3+ can be mixed with each other. | The automatic transmissions have a extended oil filling. These transmissions require no oil change for their entire service life. The approved lifetime fluid must be used after repairs on the transmission or transmission oil cooler. The lifetime oil must not be mixed with or replaced by other types of automatic transmission fluid as this will cause transmission failure. | S | |
| Brake Fluid | N/A | N/A | BMW Brake Fluid DOT 4 with low viscosity | S | |||
| Differential Gear Oil | Front Axle | 0.63 QTS. | 0.59 L | Hypoid Axle Oil G2 up to 02/2020, Hypoid Axle Oil G5 (Fuchs Titan EG 4399) from 03/2020 | S | ||
| Differential Gear Oil | Rear Axle | N/A | N/A | Hypoid Axle Oil G3 (Fuchs Titan EG 4218) Only rear differential, not for hang-on clutch (HOC) | S | ||
| Engine Coolant | High Temperature Coolant Circuit | 11.09 QTS. | 10.49 L | Frostox HT-12 antifreeze and corrosion inhibitor | S | ||
| Engine Coolant | LowTemperature Coolant Circuit | 4.75 QTS. | 4.49 L | Frostox HT-12 antifreeze and corrosion inhibitor | S | ||
| Engine Oil | 3.0L Eng | 6.86 QTS. | 6.49 L | BMW TwinPower Turbo LL17FE+ 0W-20, BMW Part No. 83 21 2 461 988 | S | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.