BIMMERMIKE

http://www.castrol.com/castrol/produ...tentId=6030793


http://www.mobil.com/USA-English/Lub..._SUV_5W-40.asp


Any oil experts here? I'm trying to compare Mobil 1 truck & suv to Castrol Syntec , both 5w40. I have free supply of Castrol syntec.

86.5 A/T 110K MILES

FBIII

That's a no-brainer.

Fabio421

I think the spec that will make the most difference in the decision would be " free supply"

BIMMERMIKE

The specs or the free supply?

FBIII

The free supply.

BIMMERMIKE

How do specs compare ? I have no prolem buying MOBIL 1

BIMMERMIKE

How do specs compare ? I have no problem buying MOBIL 1

Jim bailey - 928 International

Both far exceed the requirements of the engine...Doug Hillary from Australia is the Rennlist oil Guru and has documented his oil analysis tests.

Doug Hillary

Hi,
of course Jim is correct - both oils exceed the engine's requirements. Castrol Syntec 5w-40 is a Porsche Approved and Listed product

When changing from a SAE50 viscosity to a SAE40 viscosity oil you may notice a drop in hot idle oil pressure (OP). As long as it is above the "oil light on" situation all is well. Most engines show from 1 to 2.5bar hot idle OP with a SAE40 oil, with a normal hot operating OP around 4bar+ at 4k rpm

Regards
Doug

BIMMERMIKE

Thanks all and DOUG !
This site is what makes my ownership that much more enjoyable.
I need to join Rennlist, soon.