I have Redlin MT90 in my 00, but I want a cheaper oil for my 4th gen (I'm cheap). I know that redline is a GL4. I think that Amsoil is. Mobil 1 75W/90 Synthetic Gear Oil, which is recommended in the sticky, is NOT a GL4. It's a Gl5, according to the bottle.

So, is there anywhere to buy a GL4 gear oil? Most people in the business are not even aware that a GL5 does not supercede a GL4, and that they are in fact different.

 

I've seen NAPA carry some cheap GL4 gear oil (Stay-Lube?)... it was like $13 for a gallon.

 

Thanks, I'll try and find some of that