air-cooled-quality Mobile 1 is not available in Canada. afaik.
disappointing.
gonna do the VR1, now that Rotella T is substandard.

 

Here is the ZDDP spec for M1 from the era 964 were built
M1 API SH 15w-50 circa '93-96 1095ppm P, 1427ppm Zn

Here is the current spec
M1 API SN/SM current spec 1200ppm P, 1300ppm Zn

In what way us the current M1 not acceptable?

Sure you can spend a lot of time and more $ for Vtwin here is it's spec
M1 V twin API SJ 20w-50 1600 ppm P, 1700PPM Zn (great break in oil!!)

other good oil that I use at times
Brad Penn 20w-50 w/ ~1500ppm Zinc and ~1340-1400ppm Phosphorus

When ZDDP gets into the 2000+range it causes more issues than it cures.

 

I changed to Joe Gibbs Driven DT50, made specifically for air cooled engines, and readily available from your local Lordco store. It's a bit more money than other options, but in my opinion well worth the $$. My engine has never run as well as it does now after 2000km on DT50 15w-50.
You will thank me later.

 

Lordco, you say? Thanks for the info.

 

Semi-syn or standard motor oil....I see they sell both

 

On a BMW Blog I did find some info on the Porsche Classic 20w50.

Porsche Classic Motoroil 20w50
Zinc: 883ppm
Phosphorus: 927ppm
Viscosity at 100C: 19.1
TBN: n/a

VERY interesting, as Porsche seems to say that ZDDP are not as important as we think they are?!
Those numbers are lower than any oil, anyone here uses...

 

I think the recommendation for the 964 is 10w60 for the Porsche classic oil... Not sure what difference in ZDDP is.

 

The DT50 15w-50 is a fully synthetic oil, please check HERE

 

Anyone use Castrol GTX full synth?

 

I remember seeing a long post here and where I got my information from: http://speedtalk.com/forum/viewtopic.php?f=1&t=35836

Not sure how you got your 1000, but after talking to Mobil directly, they don't publish the information to the public as they call it 'proprietary'.

The Mobil 1 data sheet is great, (I even asked why they post it for that, but not delvac and he gave me a BS answer that it's because one is for passenger cars and the other isn't) but that's just for their synthetic oils, not all Mobil oil.

Wonder why they are so secretive, probably an emissions/diesel issue I would guess.

Regardless, I will do an oil analysis on mine to make sure nothing is out of the ordinary. I think people over-think the oil used. It should be most important to do it on appropriate intervals with new filters.

 

I was at COTA last month for the Lonestar GP. The Mobil engineer for North American racing was there and spoke at the Porscheplatz tent. It was very interesting, he asked how many people run Mobil 1 0w40 in their cars. I raised my hand along with a few others. He said that is the exact same oil running in the Porsche race cars including the 919WEC cars. It is the oil I run in my GT3 and my BMWs. Afterwards he took questions outside and I asked him specifically about my aircooled 964. He recommended Mobil1 VTwin 20 50 synthetic motorcycle oil or Mobil 1 4t syn motorcycle oil. I asked about Devlac and Rotella 6t synthetic because I also have sportbikes and read on many motorcycle forums how good these oils are in bikes. He said all diesel truck oils are for low rpm engines and not for high performance cars or motorcycles because they dont have the necessary anti foaming agents in them and at high rpm they can cause cavatation and a failed engine bearing. He was very knowledgeable and informative. I would only use Rotella 6t in my truck from now on although i used to use it in one of my past sportbikes.

 

Sounds like a plan. I googled a bit and the info on the ZDDP was on some Vette Forum, that had the same questions as this thread.
And I agree on the topic of timely oil changes. Here in Germany it is every 16,000-17,000 miles or 2/3 years. In the USA its completely different.


Indeed the 0w40 is used on most race cars by Porsche. I talked to Project 1 last week. They said they use the 0w40.

But question is how much of a factor is marketing? Or the shorter engine life? Lost power with heavier oil? Oil temps?

There are so many supposed perfomrance oils out there. Just recently I switched over to Millers Nano on all cars. On my brothers car we used the race oil and gained 6HP (5w40 vs 5w40) with that. There are other dynos with different cars from magazines.
So Id like to try their 10w60 in my 964 and put it on a dyno vs. another 10w60.

 

is it true that dino oil better lubricates seals better, thereby decreasing oil leaks?

 

Depends on the definition.

On old 4 cylinder air cooled engines it can be better, but mainly due to the materials used for seals, such as cork and other organic materials.

On more modern cars (incl. 964) I can't find any literature where a modern synthetic has any drawbacks.

 

Anecdotal evidence here... The previous owner of my current 993 used Motul 5W-40. The car had a small chain cover seep. Once I switched to Brad Penn 20W-50, the chain cover seep all but disappeared. It is still moist there, but no drops on the floor like it used to.