Mobil 10w30.

I haven't changed a single fluild in my car yet. I need to do the tranny and diff this weekend though.

It leaves an awful smell in my garage after I drive it. Has to be one of the two.

I ran Royal Purple synchromesh in my CL-S6 for about 10k and it ran great. Went back to Honda MTF two weekends ago and it feels notchier now, I'll probably change it back to the Royal Purple soon.

This

Honda MTF all the way

flushing with Penzoil and then going to GMSychroMesh friction modified for winter. Then to redline for summer me thinks. Amsoil 75-90 for rear diff for now, 75-110 for summer unless someone convinces me otherwise...