oil pressure differences by weight of oil?
oil pressure differences by weight of oil? What is everyone's experience with the different type of oil and the oil pressure readings? When does it get to be to much oil pressure and create problems down the road? Thinking about switching oils but I am running 40 at idle now and don't know what to expect when switching to a heavier oil.
What oil you running now? If you're hitting 40 at warm idle then you're certainly more than fine. Weather mainly dictates what weight oil you should run, heavier in the summer and lighter in the winter, etc. A lot of people love the German Castrol (now deemed "European Formula") 0w-30 and that's what I like to run for pretty much all the months but summer. In the summer time I like to run a 5w-30 or something a little heavier (not Mobil 1 5w-30 because it's actually a lighter weight than German Castrol's 0w-30).
I am using M1 10-30 but I want to swap. The former owner was using castrol syntec 10-40 and the engine was quiet before the swap to M1. I believe I was running a higher pressure with the 10-40. The 5-40W Amsoil is noted on this site to run 10-15 higher psi so I don't want to overdue it on the pressure. But I do want to quiet down the engine like it was. Some people say the GC did help the noise a little but the 5-40W Amsoil really made it quiet. Our weather here in the summer is close to 100.
Then I'd go ahead with the Amsoil. You can't go wrong with that. It's good stuff and considering how hot it is there, the 5w-40 shouldn't be any problem for the engine.
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From: Mooresville
Originally Posted by chevygirl
What is everyone's experience with the different type of oil and the oil pressure readings? When does it get to be to much oil pressure and create problems down the road? Thinking about switching oils but I am running 40 at idle now and don't know what to expect when switching to a heavier oil.
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From: Laguna Niguel, CA
I have a buddy that ran that(M1 0W-20) in his car (2002 Z28 M6) for a while for more 'power'. It never skipped a beat! I would NEVER run that in my car, but he did and is still ok 60K miles later!
Wow, surprising it's still going strong 60k miles later. I certainly would not even try running that unless it was an emergency situation. There's just no benefits to it. If you want 3 extra hp, do the TB bypass mod 
Originally Posted by gun5l1ng3r
I have a buddy that ran that(M1 0W-20) in his car (2002 Z28 M6) for a while for more 'power'. It never skipped a beat! I would NEVER run that in my car, but he did and is still ok 60K miles later!
i bet it leaks right past the drain plug.....
i actually gained .7 MPH at the track from running the german castrol, but after a few miles **** was rattling on cold start up and banging and clanking when it was good and warm.
i like the syntec 5w40 or 10w40 redline myself.
Because M1 has a lower viscosity, meaning it's thinner. It's harder to pump a thick liquid through a passage than it is a thin liquid, therefore when the thicker liquid comes out the other side it has a higher pressure (shoots farther) than the thinner one. It's kind of like putting your thumb over the end of a water hose, you create a higher pressure in the hose due to the decreased size of the opening at the end (or in this case, a higher pressure by thickening the oil).
Last edited by ArcticZ28; Aug 15, 2006 at 04:50 AM.
i noticed I have a little higher oil pressure when I switched from regular non synthetic 10w-30 to Mobil 7500 5w-30.. my oil pressure at idle is about 45-50.. and when im on it.. its about 60-65psi...