1999 Chevy Tahoe…had oil change auto guy put in 5W30 instead of 10W30…valves rap like never befor…had another oil change with 10 W 30 and valves still tap…just not as bad. What should I do? Should I go to synthetic?
The difference in the oils you describe are insignificant. I leave this post as oil threads are not really my thing, but you will get a good discussion going on.