MTF Comparisons?
This is a Contradiction! You just said "I used Pennzoil Syncromesh with great results"
and "Do NOT use synthetic oil in these transmissions"
What Gives?
I'd like to try the Valvoline Synchromesh... Is it a Synthetic?
I don't get why you think that this is a contradiction.
Pennzoil Syncromesh is not a synthetic manual transmission gear oil.
Yes, it is ''lighter'' than regular 90w gear oils, but that doesn't mean it's synthetic.
It's kinda like AJ uses which is 50/50 Dexron ATF and regular GL4 dino gear oil.
It worked well for me in a good condition '71 regular A-Body 833, and I shifted it fast under power...
Valvoline, I don't know of and never tried it.
I do know that Red Line synthetic manual transmission fluid won't work.
A friend of mine tried it in a '69 Super Bee and it clashed.
After dropping the oil and flushing the tranny, he installed the Pennzoil Syncromesh oil that I recommended to him in the first place.
He thought he was doing the ''right thing'' with a customer's car.
https://www.pennzoil.com/en_ca/prod...ls/synchromesh-manual-transmission-fluid.html