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?
Valvoline says it's made with "premium base stocks." It has a pretty high viscosity index, one that is usually associated with synthetics, so it may be at least a blend.