blodstrupmoen

And do you think that is a good oil? I learned i pre-school never to use oil made for motorcycles on car engines. This is because a motorcycle engine has a wet clutch and therefore needs more friction. Same other way around , a good car engine oil on a motorcycle could cause the clutch to start slipping.
And btw a motorcycle is designed for higher rpm, and higher rpm needs lower viscosity .
In a car engine we idealy don`t want friction. Racing engines often uses oil with addetives that gives a very low friction, but then again these additives are often very aggresive to the bearings and suits engines that are often serviced.

And about Mobil 1:
.. Mobil 1 does not work that good in applications which operate at longer times at higher temp levels . Like at track driving.
It is a known fact that mobil 1 oils tends to glogg up the turbochargers and piping.

A very know rally driver and engine builder measured viscosity 10 and lower at high temp on a multigrade 15-50 oil straight after a race. He has tested several multigrade oils, all with similar results.
Viscosity in multigrade oils would fall faster and lower because of the additives ability to withstand heat and pressure. And here is the main problem in a turbo application , there is more heat in every part of the engine.
In a problem area such as a bearing the temp would be high and pressure up to 20 000psi.. Then you could take apart the differnt additives and see at what temp and pressure the molecules start breaking appart. ?

When making multigrade oils , the oil company has to take into account al sort of things from temperatur changes to people thats in a hurry and does not have the time for the engine oil to heat properly.. etc etc.. Multigrade oils are just a compromise for everyday and all year use.
The people at GM has done a lot of research on this , and they have published a lot of useful info..


Now here is a link to Le , with some usefull info.

sorry for all misspelling and bad lingo ; )

http://www.le-inc.com/

LFA951

I'm glad I use Amsoil 20W50 in my car!

bleucamaro

Mobil 1 5W40 diesel truck oil here.

odurandina

it's getting cold out there...

i'm gonna run a mix of 0w-40 and 0w-50 racing oil for the early winter.

ehall

You can use whatever viscosity that you want and it doesn't matter. If the oil conforms only to the latest API standard, which the vast majority do, you need a ZDDP additive. If you run a CAt, the ZDDP will prematurely clog it, which is why ithe levels were reduced in the current standard in the first place. Our cars need more ZDDP.

Scott72

I used to run Valvoline VR-1 in all our cars, but recently switched Brad Penn Racing Oils. Plenty of ZDDP in them. A lot of the early 911 guys run Brad Penn.

http://www.penngrade1.com/Zinc.aspx

Baptizo

Necrothread!

I use Royal Purple in my 951 - 5W30.

kinglenario

This is why I've been using Amsoil Z-Rod. Has extra ZDDP for older cars with flat tappet camshafts. I don't know if it's as good as the diesel stuff but it seems to be working great with good oil pressure and quiet operation. Interesting info about flat tappets on their site. Not sure about the corrosion protection...

http://www.amsoil.com/storefront/zrf.aspx

Although on the Amsoil website it recommends 5w40 European car formula and says 'Especially for turbocharged cars'. I have no idea about the zddp and other additives in that though. Might give them a call.

ehall

I still use the VR1. I add ZDDPlus additive to it. I actually come out ahead, monetarily that way, by a fairly good margin, but if not for price, I would certainly run the Penn. It's good stuff.

333pg333

Wow it must be REALLY cold where you live!!!!

ehall

In the winter it is. He lives in Ohio. Chris White, some time ago made a point that most 951 owners run an oil with a viscosity level that is too high. It's on one of the trillions of oil threads here, somewhere.
As long as it doesn't leak, why not? Ofcourse here in Florida, I need some weight in my oil. It tastes much better!

Ben951S

Isn't the Mobil 1 15-50 'Racing Use' or whatever little red flag and label they put on it, have ZDDP in it?

Lemming

I've used Rotella for years and have taken crap for using it instead of Mobil

For the race car, I mix my own brew of rotella and Amsoil, witches brew!

ehall

I don't know. That alone won't tell you anything. Look for the A.P.I. seal on the bottle. That will tell you if it is the current standard, which is much lower in ZDDP than we need.

jpop8807

I just bought VR1 for the first time. The guy prior to me was running 10-30 amsoil but all the guys on here said run thicker oil. I noticed when i bought the VR1 it has yellow labels on it that says high in zinc. Also would it be better running something synthetic instead of vr1? What are the differences?