ehall

The viscosity, within reason, means less than the actually oil composition. Do a search for ZDDP.
Motorcycle oils tend to be much higher in ZDDP than oils designed for catalytic converters.
The pressure, itself, as long as it's within specs, isn't so important, unless your racing. 5w-60, made properly, with the right components, won't help or hurt longevity.

DanR

I run mobil 1 15/50 and 4.5 at start up, 3.5-4 at warm idle and 2.5/3 at idle after a track session (engine less than 2000 miles since full rebuild)

fbgh2o

I run Amsoil Dominator 15W-50 Racing Oil and get 4.75 to 5 cold, 3.5-4 at operating temperature

333pg333

Do you track that car? Doesn't look like it. Why did you have to get new rod bearings? That's not the best oil you could use for our cars.

billthe3

I'm running royal purple 10w-40 and am getting around 3-3.5 at idle now. When I was running rp 20w-50 I could never get it below 4 at idle (street driving).

951North

While we are on the subject, I am running vr1 20-50. I've never seen less than 4 bar hot. Is too much pressure bad? Maybye I should run a 10 weight?

333pg333

No. What you have is good.

Thom

+1.

IMO running anything lighter than 10W40 on these cars is playing russian roulette with main & rod bearings.

I currently run Castrol RS 10W60.
~3.5/4 bar @hot idle (bottom end with original bearings has 160k miles).

toddk911

Long time Porsche mech always told me "1bar per 1K rpm" is safe.

so at 1K = 1bar

3K = 3 bar, etc.

seattle951

Royal Purple XLR, 10W-30, 3.75 bar at hot idle.

bigdeano

2.5-3 Bar at hot idle running 10W50

hally

everybody is all barred up over this one

JET951

too true Hally,
unfortunately its all a waste of time. unless we all run a mechanical oil pressure gauge and a temp sender in our oil we will not see any true results.
one persons hot oil temp is someone elses medium temperature. the oil pressure gauges and senders on these cars are not what one would call accurate.
even though our oil pressure gauge only goes to 5 BAR, the oil pressure relief valve opens at 8 BAR. that means when you rev your car when cold to say 3000rpm you will get the oprv to open which means you are exceeding 8 bar. there is no such thing as excessive oil pressure(if your OPRV got stuck closed it will blow your oil filter clean off)....there is such a thing as insufficient oil pressure.

333pg333

Jeez, he doesn't say much on here anymore but what does come out is just gold.

Luis de Prat

The Porsche OPC in Switzerland recommended Mobil 1 5W-50 for my 951 when I bought it back in 2000 and it's worked very well for me so far.

I don't think the motorcycle 10W-60 will harm your engine at all, but I would go back to regular Mobil 1, personally, since it's specifically for performance automobile engines.

On another note, Velns, do you still have that wildly amusing video of you driving a Benz in the snow to the sound of BT? Link please! That was great!