Common fluid families
- ATF specifications — some vehicles specify a particular automatic transmission fluid grade.
- Dedicated power steering fluid — some European models specify a dedicated fluid family.
- Manufacturer-specific specifications — always check the cap, manual or service manual.
Why not to mix
- Additive packages differ between specifications.
- Mixing can cloud the fluid and form deposits.
- Seals may swell or shrink, causing leaks and reduced assistance.
- If the wrong fluid was added, change and bleed the system rather than diluting it.
When to change
- Fluid clearly darkened or black.
- A burnt smell.
- Milky or emulsified fluid, which indicates water ingress.
- Metal particles or debris, which indicate wear.
- The interval in the owner’s manual — intervals vary widely between manufacturers.
Checking the level
- Park on level ground and check in the hot or cold condition the manual specifies.
- Clean the dipstick or sight glass before reading.
- The level should sit between the specified marks.
- A steadily falling level means a leak — find it before topping up.
Cautions
- Never substitute brake fluid, engine oil or coolant.
- Bleed the system after a fluid change.
- Fluid type, capacity and interval follow the manufacturer, not this page.
Send us your chassis number or original part number and we will confirm the reference.