chevygirl

iTrader: (69)

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.

ArcticZ28

iTrader: (14)

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).

01ls1lover

iTrader: (18)

Ive never seen or herd of this german ****... were could i find it?

ArcticZ28

iTrader: (14)

AutoZone, Advance, WalMart, etc. You just gotta look for it. I know I personally can never find it in my area and have to go about 20 min south or north to find it.

chevygirl

iTrader: (69)

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.

ArcticZ28

iTrader: (14)

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.

rjgto

I'll actually answer your question - Going from 15-40 Rotella to Mobil 1 0-20 reduced my oil pressure by 10 lbs.

ArcticZ28

iTrader: (14)

Why would you go with that thin of oil? That's insanely thin.

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!

ArcticZ28

iTrader: (14)

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

TJ

iTrader: (10)

that **** pours like water, i cant imagine after milage gets on it and it breaks down.
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.

yak

iTrader: (15)

i lost close to 10# going from GC to M! 10-40

chevygirl

iTrader: (69)

Why does the M1 always come up with lower oil pressure readings? Why does the thicker other brands run a higher oil pressure?

ArcticZ28

iTrader: (14)

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).

chevygirl

iTrader: (69)

Thanks arcticz28 that was great info.

GR33N GoblinM6

iTrader: (14)

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...

chevygirl

iTrader: (69)

What kind of oil pressure are you guys running using the 5-40 Amsoil or 10-40 any brand?