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Re: Ford LV brake fluid use in older vehicles
Posted to Technical Discussion Forum on 5/2/2026

No Problem.

The Ford WSS-M6C65-A2 (DOT 4-Class6 or ISO 4925 Class 6) is backwards compatible to any DOT 3 in the same way that Dexron VI ATF is backwards compatible to Dexron III.

Both newer fluids are much lower viscosity and require higher grade base sto... Login to read more.