Ive been looking around at all these auto parts for royal purple and the only one i found was Max-Gear 75w-90 for the differential
i was unable to find Synchromax for the transmission
so my question is could i use Max-Gear 75w-90 on the manual transmission even though it has the ls additive in it because their site actually says for recommended use in manual transmission
does anyone use it in their manual transmission, does it do no harm

 

yes i am using max gear in my tranny. i like it way better than redline. as long as it's GL-4 it's ok. RP is approved for GL4 + GL5. go ahead and use it,

 

thanks just wanted to make sure

 

Amsoil I've found to be better than Royal Purple.