Best Oil for Car that had Dirty Engine.
So I bought a 2006 Toyota Matrix this year, with 68000KM On it. When I had it brought into the shop, they called me back to come see the Oil Gastet under the hood which was totally covered with sludge baked on. I paid almost $1500 for a Hot Oil Flush, and for them to clean it out, as well as a few other things. They put in Castrol Edge Synthetic after, and told me to come back in a month for another oil change.
Which oil should I go with this time? I'm considering Valvoline/Castrol or PennZoil Synthetics. Also, is there any other additivies I should think about adding? Right now I am considering Pennzoil Ultra or Platnum as preferred. Just want to know the best course of action with this dirty engine, that got cleaned in the pan and gasket.... Thanks