Now what do I do?

[Blue Goose]

I use 5w40 Rotella Synthetic in my 6.0 and change it every 5,000 miles.

 

[DNFXDLI]

Been running Amsoil for years in all kinds of vehicles as have many,many people I know. Never had a problem.

 

[mrxlh]

Chevron Delo 15W40 is the best oil money can buy. By a Federal Judge ruling it is synthetic, although it is not marketed as such. Nothing wrong with Scamsoil, it just cots way more than it should.