Is it wrong to err higher on ATF, Brake Fluid Spec/Grade?
If I use, say ATF Dexron Mercon III on an 87 300D vice ATF regular, am I headed for damage or a transmission rebuild?

Likewise, I rebuilt my whole 87 300D brake system. I used DOT 4 vice DOT 3.

I know you shouldnt take Fluid specs lightly. I once ruined a 240D transmission (manual) by using Gear Oil vice ATF

Any advice?

Is it wrong to err higher on ATF, Brake Fluid Spec/Grade?



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1983 240D 240K owner rebuilt engine

My understanding is that Mercon/Dextron III supercedes Mercon/Dextron II standards, so the new stuff could only be better.
This is assuming your tranny calls for Mercon/Dextron II, of course.
Besides, I do not think they sell "II" anymore.


On the brake fluid, I always upgrade to DOT4, and have never had a problem. The boiling point is higher, and the moisture absorbtion potential is lower. Some owner's manuals continue to insist upon DOT 3. Could be a reason for this, but I am not aware of any.

Avoid DOT5, since that is a whole other matter, and not compatible.

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1986 300E 5-Speed 240k mi.