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Join Date: Dec 2013
Location: Buckinghamshire, UK
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Oil for standard 1989 930

What grade of engine oil is best in my standard 1989 930 running in a UK climate (wet and not very warm most of the time)
Old 01-17-2014, 03:10 PM
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hi there,

I have a pretty much standard 930 and where i have it serviced use 10W40 semi synthetic. Its changed every 6000 miles. he always uses Havoline.

Cheers
TIM
Devon.
Old 01-18-2014, 12:45 AM
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There is no single answer to this much asked question. Generally most use 20/50 weight dinosaur oil, many have switched to full synthetic which may or may not spring some leaks depending on the condition of engine seals. Full synthetic won't coke up in your turbo as much as dinosaur oil.

Do choose an oil that has the highest ZDDP (zinc content) as possible to minimize wear on the rocker arms and cam surfaces. Zinc isn't necessarily good on the catalytic converter, though, which is why oil manufacturers have gone away from high zinc formulations. But then many of us have removed the cats anyway so no issue there.

I use Valvoline VR1 racing 20/50, for what it's worth.
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Old 01-18-2014, 05:41 AM
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Here is a page of your owners manual which you really should read. You will find that, even in 1989, Porsche was switching to synthetic oils. The grade of oil specified in 1989 was API class SF. In 2014 we are up to SN, vastly better performance in the same standardized tests.

Oil is a marketing game, and in 1989 Shell oil was the official oil of Porsche. Around 1995 Mobil 1 became the official oil of Porsche, and remains so to this day.

Modern synthetic oils contain Zinc and Phosphorus (ZDDP) compounds at adequate levels to vastly exceed the anti-wear capabilities of the original fill oil for your vehicle. I use Mobil 1 15W-50 advance full synthetic. It is specifically recommended for high performance engines with non-roller camshafts (such as your engine). The technical data for this oil may be found here:

http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf

There are two areas where synthetic oil is critical, turbocharger seal ring and piston oil cooling jet. Both of these items are adversely affected by using conventional oil. Conventional oil contains a number of short chain hydrocarbons that quickly oxidize into carbon. The carbon deposits may jam the turbocharger turbine oil seal ring, and clog the piston cooling jets.

Old 01-18-2014, 07:58 AM
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15w40 Rotella(shell oil).. For what its worth.
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Old 01-18-2014, 08:08 AM
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Not a good choice. For starters, that is a diesel oil, and is rated according to diesel test criterion. There are no high speed tests for diesel oil, for instance. Additionally, it has relatively low levels of phosphorus, especially in the new synthetic Rotella T6. It used to be the go to oil back in the day, because of the shear stability. Now you can get the same or greater shear stability with a gasoline wear additive package in any number of synthetic automotive oils.


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Originally Posted by 81Kremer930 View Post
15w40 Rotella(shell oil).. For what its worth.
Old 01-18-2014, 08:20 AM
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I very satisfactory choice, but might want to consider full synthetic. Sensible oil change interval too.
Quote:
hi there,



I have a pretty much standard 930 and where i have it serviced use 10W40 semi synthetic. Its changed every 6000 miles. he always uses Havoline.



Cheers

TIM

Devon.
Old 01-18-2014, 08:41 AM
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Rotella

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Originally Posted by Speedy Squirrel View Post
Not a good choice. For starters, that is a diesel oil, and is rated according to diesel test criterion. There are no high speed tests for diesel oil, for instance. Additionally, it has relatively low levels of phosphorus, especially in the new synthetic Rotella T6. It used to be the go to oil back in the day, because of the shear stability. Now you can get the same or greater shear stability with a gasoline wear additive package in any number of synthetic automotive oils.
I have had zero issues for 4 years in my 84 carerra, or my 930... I don't track either car, just drive them in a spirited fashion. I change it twice a year, doesn't burn any and never gets hot.(both cars have front mount coolers). Its all a matter of choice, and there are several to choose from.
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Old 01-18-2014, 08:46 AM
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Quote:
Originally Posted by 81Kremer930 View Post
15w40 Rotella(shell oil).. For what its worth.
Same here... tried Brad Penn oil once and never will again. Rotella works great.
Old 01-18-2014, 05:54 PM
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synthetic oil pressure

Hi guys,
I posted in another thread about change to synthetic oil (Redline 10w60) and saw significant
difference in Druck press especially when engine is warm and at higher RPMs. Some recommend I switch back to Pensoil 20w50, your thoughts?

Peter
Old 02-04-2014, 04:44 PM
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Hi David

I live near Epsom and use Mobile Super 2000 10W-40 in my standard 330 HP motor, I use to run on Mobile 1

regards kev
Old 02-05-2014, 08:31 AM
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Benny771,

Curious what got you turned off to Brad Penn if you're up for sharing.

Thanks
Old 02-05-2014, 01:12 PM
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