moo... I think you car would benefit from the seafoam treatment with that many miles on it. Do searches on the topic and read about it... Even a 30K mile engine will burn up some carbon buildup. I think a thin oil like that would be easier for you to end up burning more oil from the worn out seals and such. I think the last time I got 10 40, or was it straight 40... I can't remember now. Thicker oil will also help quit the engine a little.