I run 10w30 usually but going to a heavier weight wont hurt in this area. I have used 15w40 and 20w50 with no issues.

On my daily driver (a car I don't care about by the way). I had a massive oil leak leaving puddles. I used Lucas oil stop leak and it stopped it completely and my lifter noise went away in a couple hundred miles. I don't know about any harmful long term effects but it has gone 6000 miles so far with no problems.


Richard
42 Chevy pickup
65 Chevy C10 Panel