I've always used M1 15W-50 and can no longer find 5QT jugs here.

Taylor

 

Anecdotal experiences are nice but without controlled testing you can't reach any accurate conclusions on oils. Viscosity by itself is only one part of the equation. The additive package is very important regardless of the base oil stock.

 

Hmm, the line between anecdotal (a nice way of saying rumour, hearsay, or myth) and fact, gets blurred when it is backed up by numerous experiences with mechanics working on these cars day in, day out.
Granted, it's not lab controlled testing, but in some cases it's as much or more relevant than some guy in a labcoat doing tests. Also, there have been plenty of cases with different results of oil analysis...so they start to become anecdotal.

 

Not true -- the engineers designing the 928 engine (half of which became the 944 engine) knew that synthetic oil technology was coming, and designed the engine tolerances accordingly, even though the oils weren't yet in widespread use.

My S2 has only ever been run with Mobil 1 since new, AFAICT from the service records. Oil changes every 10,000km (6000mi), which is half the factory recommended distance for S2 (but the factory recommended distance for the Turbos).

With about 180,000km on the odometer, it burns about 1/2 litre of oil between 10,000km oil changes, which I think is pretty good. So perhaps I'm boring and conservative, but I think I'll stick to the Mobil 1 -- I use Mobil 1 5w-50 (which is one of the oils on the latest factory approved oil list -- IIRC, landsharkoz had links on his website to some pdf files of these lists... perhaps that's even one of the links above).

I wouldn't bother using a synthetic in an engine that burns a lot of oil, however. That's just an expensive exercise in futility all around. Match up the oil to the current condition of the engine.

 

German engineers like to conduct a lot of street and track testing...

As Doug Hillary has correctly pointed out, UOA is to determine if an oil is good for further service. A UOA can not tell you if one oil lubricates the engine better than another. You'd need to conduct the appropriate and extensive car maker oil test sequence to determine if one oil performs better in the engine.

http://www.bobistheoilguy.com/cms/in...onth&Itemid=71

The ACEA A3/B4 test standards are the basis for many Euro car maker oil specifications plus the engine family specific additional testing.

http://www.acea.be/images/uploads/pu..._LD_and_HD.pdf[/QUOTE]

 

Ha, I wondered how long it would be until the Dougster's name popped up. Sorry but I just don't listen to Doug. He has contradicted himself too many times on various forums. His background is running a truck fleet and pootling about in a Boxter. He doesn't have experience in the field of Porsche trained mechanics who work on these motors on a daily basis. As for Bitog. Well if you dare question any of Doug's statements, you get booted off the forum. I'm out of this discussion. Thanks.

 

Oil is a religion for some. For others it's a matter of science and the ability to objectively quantify performance. I have no association with any oil company, Doug Hillary or anyone on BITOG. I'm just stating what is known to be factual info. regarding oil and testing. A $25 UOA is for determining if an oil is still serviceable and not how well it lubricates the engine because it can't provide that info. An oil test sequence is the objective test methodology for determining actual oil performance in an engine.

 

Agreed.

 

Where did you obtain this info? The tech I have used for 15 yrs, was Porsche certified tech before opening his shop. He is the one who advised me. 36 yrs of 944/928/911. He likes M1, but not in the 944. Advised me I could run it but better off staying Dino.

I would have considered myself the conservative one sticking with Dino.

 

There is a plastic "badge" stuck to the underside of the bonnet on my '89 S2 which says "Mobil 1 15W50 Synthetic Motor Oil", which would have been placed there at the factory. So I would imagine that the Synthetic Oils were at least recommended for the S2. Anyone else have this badge under the hood of their S2/Turbo?
I do agree though, that an oil with higher levels of ZDDP should improve wear resistance for the flat tappet 944 engine. I currently use Mobil 1 5W/50, but I am changing to Penrite Syn20 (20W60 - label states can be used where 20W50 oil is specified by manufacturer - which it is for the 944) for summer as this oil has higher ZDDP and should be more suitable for track use.

 

That is correct, I while ago I called Ray Catena in Edison NJ, and they told me to use Mobil 15w50 or 0W40. I wanted to make sure and called Pepe Porsche in White PLains NY. I got the same answer. I guess the dealers wouldn't be using it to blow up engines. I'm using now M1 10w40 High mileage(Engine has 73K), Which has 1000ZDDP. Engine is actually very quiet. I'm not going higher than 10w for the simple reason of living in NY. Winter here sometimes gets below 0 Degrees.

 

Well for the Aussies in this thread, and for anyone living where it doesn't get down to below -10c, the factory handbook recommends a 20w/50 right in the middle of the page. There are clearly other oils also on that page, but it never gets anywhere near -10c in Sydney and I doubt it for you two in QLD.

The dealers are paid to plug and sell products. In many cases, especially in the US that product is Mobil. 1000ppm of ZDDP isn't really high enough in many people's books.

 

My friend, you made the correct decision in the last post when you said..."I'm out oif this."

lol. I would have thought you'd known better!

 

You're right.

 

Hi Eric , that Mobil 1 sticker was placed there by a previous owner or service provider in the last decade or so , Porsche was still using Shell engine oil up to the last of the 968 series ( meaning to the end of 1995 ) , so there is no possible way that sticker on you're 944S2 was fitted by the Porsche Factory .

Regards
Bruce Buchanan