Valvoline and Pennzoil for me. Been using the SynPower MST C3 5W-30 for years now. I've started using the Everglide EGS with it as my oil additive. I was curious as their field trial results and analysis are pretty impressive. The first time I've heard of an oil additive that is based on the Moly-Graphene formula. I'm pleased with it so far. Looks like the anti-friction properties made my car generate less noise.