Quote:
Originally Posted by princeq
I am planning to flush the gearbox this year.
Currently around 38k miles.
Or do you think just to change it is enough?
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I am not an expert, but based on my experience with my 113,000 mile transmission:
At 38,000 miles if you want to be super careful, send a sample of the transmission fluid for analysis and then decide.
The danger with dirty sludgy transmission fluid is that when you flush it, the sludge and solids could get caught up in the delicate passages and the solenoids
In my opinion, unless you were tracking with the car or exclusively driving it in bumper-to-bumper traffic, your transmission fluid should still be in excellent condition. Therefore flushing it will not hurt it. But, is it really necessary to flush?
Flushing it will not hurt anything at 38k, but in my opinion is just an unnecessary extra work and a low-yield effort. In the best case, you will improve 70%-80% new fluid to 100% new fluid. I believe that replacing your fluid 70-80% every 50- 60,000 miles or less will provide you the same or very close protection to constant flushing.
But for a piece of mind, and for the experience, flushing would definitely be fine, albeit unnecessary. Of course, you should still replace your transmission filter.