im changing my oil in tranny, i picked up castrol syntec gear oil 75w-90 gl-5 will that do the trick.? pls help

 

Expect some minor corrosion of yellow metals in the transmission using a GL-5 fluid, I prefer Amsoil MTG (GL-4)

http://www.amsoil.com/storefront/mtg.aspx

 

redline mt-90 has worked the best for me so far

 

I use the NEO Synthetic 75-90 RHD, that's expensive, but damn good

 

Ive got a mix of about 75% redline MT90 and 25% lucas 75-90 right now and the car has never shifted better. Ive actually got some synchros on their way out so it hasnt shifted well for the last 2 seasons. I did my annual fluid change and I ran out of the redline so topped it up with the lucas. For a fairly worn transmission it shifts VERY well.

 

This is usually how these threads go, everyone votes for their pet oil and throws in a "it's never shifted better etc" (completely subjective comment - and essentially worthless scientifically)

Didn't we just get done kicking this around a month ago?
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/synthetic-oil-fd-trans-you-decide-900341/