I was just wondering if anybody uses oil additives in their tranny's, crankcase or differentials? I regularily use Lucas Oil Treatment in my 1993 Mazda truck and the wife's 2000 Subaru Legacy wagon. I was thinking about putting the proper ratio (30%-50%) into my 04 700 when I replace the fluids.

 

Why? All of the synthetic fluids are more than enough.

 

I bet if you read the owners manual on your cars it will tell you not to use any additives in your oil.

 

Like he said. My choice is Amsoil.