Hey guys, got a question for you, I have a Fram ultra on deck, and was wondering what oils are good for a 10K oci. I know the usual suspects Royal Purple, AMSOIL Signature Series, Mobil 1 Extended Performance, but what about PP, PU, or Quaker State Ultimate Durability? Right now I'm using GOIL, but I'm concerned about the low TBN's and the rapid viscosity shearing, I'm only using it for 5k because of that, even though I'm putting a fresh qt in every 2200 miles. This is for my malibu 3.1 liter, thanks in advance!