OK . in the past combos I used 20/50 brad Penn,valvoline and 15/50 amsoil with .002 on mains and rods and never had an issue.
The only way to know for sure is to have what you were using tested. Like I said, the oil grading system is very wide. You can buy a 50 that is very close to a 40 or it can be very close to a 60 or anywhere in between.
I tried to find numbers for the oil you were using and I can't. I may call them and see what I can find.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
