Should I use mobil 1 tri-syn or sup-syn?
00 GS-R

 

Either will work just fine. Follow the factory recommended service intervals.

 

tri-syn is the old formula that isn't made anymore but either formual is still fine.

 

whoa.. where the hell did you find the trisyn still around??? didnt they like stop making that last year or so?

 

Both work fine.

 

there was a huge oil debate a while back (or was it on honda-acura.net??) concerning everything you would ever need to know about oils.

the general consensus was that amsoil and valvoline max-life were the two best oils as far as protection goes due to proper amounts of zinc, etc...