Imported Syntec 5w40?
1.) you're the one who said Amsoil was better...so if you want to pull yourself out of the BS bin it will be your task to do all the analysis to support your (insupported) claim.
2.) nobody here made any claims about tow rig applications...this is ls1tech.com not towrig.com so we're talking about oil performance in LS1 powertrains.
-Kevin


