Well, I have sort of changed my mind. I was going to use Mobil 1 0w40 in my 95 Lincoln Town Car after the auto rx.Now I am thinking like a 10w40 redline oil for the HOT weather big grocery hauling I do down here by Austin Tx . Would this be too thick for a car that says it prefers 5w30 ? At 133,000 and no oil usage wouldn't 10w40 keep in the same condition it's in for a long time.Or, is 0w40 easier for start up? Thanks for your replies!