Mobil 1 European Car Formula 5W50 in a Silverado

Apr 27, 2010
Suburban Washington DC
Just want to experiment on my 2007 Silverado 6.0L 210,000 mile truck. Used 10W40 the last oil change 2 years ago after coming off 5W30. With 5W30 at 1700 rpm cruising oil gauge was at 30 psi and downshifting to 2700 was not much better. Hot idle was 20 psi. which is fine.

Using 10W40, the first two numbers went up maybe 3 psi, idle the same. Time for an oil change and thinking of trying a 5W50 this time just for curiosity. This is on sale: Any guesses what it might do?
If going from a 30 to a 40 raised pressure by 3 psi, won't going to a 50 weight take it up another 3 psi? Or it's not a linear progression?

Why are you trying to increase the pressure? That's the first question.

Also, is this one of the LSx engines that are prone to developing a leak at the pick-up tube? @clinebarger knows the details on that far better than I do, but I recall some discussion around LSx oil pressure and this was a common problem.