[Johnny Mullet]

Synchromesh is equivalent to 30 Wt oil and has friction modifyers in it. If it is working well for you, use it! I will not use anything else in either of my manual transmissions in the Metros. The Synchromesh also stays cleaner longer. I drained the trans on my 98 Metro after 30K (suggested change interval) and I felt that I wasted some good oil since it came out so clean. I am now going to go 60K before trans oil changes.