Hi all,

I've got 212k on the motor and about to do a transmission fluid change - sadly, the first in 100k. My question is this: can I switch to the MT-85 synthetic fluid? I've heard that some folks think that changing to synthetic OIL with high mileage can possibly cause leaks in seals and gaskets, and just want to know if that same logic holds for transmissions.

Any thoughts?

Jack

 

I switched to synthetic fluid at over 100k on 2 different Maximas with no issues other than smoother shifting. If you don't leak now I doubt you would with synthetic, and at that mileage you could develop one anytime anyway.

 

Point taken on the possibility of leaks...hadn't thought of it that way before! Thanks for the advice and experience!

Jack

 

I swapped mine to a Royal Purple synthetic fluid when I bought my 5.5. That way I can start fresh new records. Shifts great when the fluids are warm. I highly recommend the just a drain and not a flush. Drop the pan and spray clean with like brake cleaner to get the buildup removed. While you're at it, change the filter. I want to say, when I did mine a couple months ago, I spent $15 for the filter and $12 a quart of fluid.

Good luck!

V/r,
Gray, Raymond.

 

Hello!

Thanks for the input. I should have mentioned this - I have the 6 speed manual with HLSD. So, no filter for me, no pan to drop.

While I'm at it, does my fluid choice change since I have the HLSD?

Jack

 

Don't know about the 5.5 gen manual tranny, but the 4th gen specifies GL-4 fluid only. Check your manual, and if it says GL-4 only, get GL-4 only. No GL5-4-3 combo stuff either. GL-4 only. Did I mention GL-4?

For example, Redline MT-90 75W90 is GL-4 synthetic gear oil. Great stuff.



DW