synthetic oil in an old motor?

[Rev]

Originally Posted by bmxmon

its all good, the only place that you dont want synthetic oil is in a new engine.

I think Porsche, Corvette, and some others come from the factory with Mobil 1. Maybe they were broken in first with mineral oil, I don't know. What I do is use high quality mineral oil with a couple of changes for about 5,000 miles for the break in and then switch to Mobil 1. Not sure if that's really necessary, but that's the way I do it.

To address the original question, I think I would just stick with a good multi grade detergent mineral oil after 130,000 miles. I would use a little heavier grade like 10W50 maybe. At least that's what I do with my cars and it has worked well.

I do always use Mobil 1 now with new cars/engines after the 5000 mile break in. It does hurt a little buying 16 qts of Mobil 1 @ $4.50/qt. when oil change time comes for my 3 cars. Just think what it would be if I paid someone else to do it. And then there's the filters, sniff, sniff.

Rev