DO i need to flush coolant @ 40k miles?
I am gettin ready to change all my fluids after my next gas fillup. Check over my list.
I am gonna do:
6 qt mobil 1 5w30 (or whatever the recommended viscosity is)
4 qts penzoil Dexron iii mercon atf fluid
2 qts 75w90 coastal diff fluid & rear additive (do i need this for torsen?)
1 qt any brand power steering fluid (just gonna suck out some and refill a few times, not flushing)
Already did my brakes.
Might do my clutch if i can figure out how to bleed the dang thing.
German Castrol 0-30 is the generally recommended oil around here, and you can find it in our Michigan autozones. Mobil 5-30 isn't wrong, but the Castrol is preferred.
I use Mobil synthetic rear diff oil. The way I see it the 10 bolt needs all the help it can get. I still use GM diff additive but I think you can get away w/o it using synthetic oil.
Use Dextron VI trans fluid. It is newer and equivalent or exceeds Dexron III in all ways.
You are right though about using Dex cool again. Coolants should not be mixed and you should add only distilled water.
Peace.



