This link has been around before. It doesn't answer the question about mixing oils which I believe most agree that it is ok to do so.

http://www.performanceoilnews.com/oi...nst_oils.shtml

 

Well, Mobil 1 isn't cheap in Germany either. My point is both are very high quality so I wouldn't despair. My 997S has only had Mobil 1 and that's fine with me.

 

only way to know whats better, is try to do similar driving on 2 different types of oils.
then send it out and have it tested.See which held up better with the same amount of miles and similar driving.

 

There's an interesting article on page 38 of the May 2011 Excellence magazine on the range of oils from groups 1 through 5. In a nutshell group 1 through group 3 are conventional oils and groups 4 and 5 are synthetic. Mobil 1 and other common synthetics are in group 4 and Redline and Motul are in group 5. It's very clear the author favors group 5 as the best oils on the market, in particular for high performance engines.

When I got my TPC turbo, Mike Levitas told me to use Redline oil, and I must admit I was a little skeptical thinking Mobil 1 was just fine. This article gives the underlying reasons why Redline and Motul are superior. I'm planning on using Redline or Motul for my next oil change!

 

i stocked up with mobil 1 5w50 and mobil 1 15w50 and will keep using them - so far my car had no issues at all running on both.

 

FWIW... my dealer switched from Mobil 1 0W40 to Mobil 1 5W40, about a year ago.

 

Adias,
Wonder where he got M1 5w40 unless he's using diesel. Any idea?
I can't find M1 5w40 here in the States.
Maybe 50 gal drums from Europe?

FWIW Castrol Syntec Euro 5-40 will become "Edge" "with Syntec Technology" to compete
with other mfrs in the race for best lubricant. I think they are waiting for OEM approval
as far as Porsche is concerned, I looked at some bottles and also online and the 'Porsche approved' is not there as it was before on the Syntec bottles.

 

Yeah Mobil 5w-40 is a hard oil to find.

I use Castrol 5w-40 which is Porsche approved and is superior to Mobil 1 Euro blend. Also, Castrol comes highly recommended by LN engineering.

Jason

 

I always find oil discussions interesting - they pop up every 3 months or so. Is there any evidence that using Mobil 1 0W-40 contributes to engine failure or premature engine wear?

 

Quote of the day

 

I also use the Castrol syntec 5-40. I sent in a sample of my used oil to Blackstone and analysis came out great. No deviations from average, all additives still within range. Last remark was 'great engine!' (M96).

 

seriosly speaking - in my car it contributes to valve lifters knocking.
also it seems to burn out faster than 5w50.

40 vs 50 diff is benefitial for engines that run on a track a lot. 0 vs 5 diff is not that obvious to me. still, 5w50 works just fine and is recommended by porsche, so, i see no objections why not to use 5w50.

15w50 is fine for summer but will get too heavy in winter and it may affect engine negatively when you start it in the cold.

 

Theres a big sticker that says MOBIL 1 in the boot. If there was some engine problem you dont think the engineer would say something like "DAS ÖL IST PURPURROT! HEBEN SIE DIE GARANTIE AUF!" (The oil is purple! (Royal Purple) Void das warranty!"

 

sorry thats crap - 0W40 - is a superior quality oil as its thinner and is recommended as its factory fill

 

Uhh no no no no....

There are many recommended Porsche oils including Castrol and Motul. Knowing the attributes of each oil is easy and reads like the nutrition labels on food in a grocery store.

Porsche factory oil is Mobil because Mobil gives them lots of money to do so. Kinda like Nationwide is a sponsor of NASCAR. Does not really make it the best insurance company though. Or probably a better comparison would be Gatorade or a Powerade sponsoring athletes.

If your interested in what the labels and numbers on the back of your oil is saying about what you put in your engine you can go to www.LNEngineering. com.


Mobil 1 0w40 SM 3.6 x
Mobil Delvac 1 / Mobil 1 Truck & Diesel 5w40 CJ-4/SM 4.1
Mobil 1 Synt S Special V 505.01 (Europe only) 5w40 SJ 4.67
Mobil 1 (Canada) 5w50 SM 4.3 x
VW 505.01 Castrol 5w40 SL 4.5
Castrol Syntec 5w40 SL ? x
Castrol Syntec 5w50 SM ?
Motul 300V 5w40 SH 4.51
Motul 8100 X-Cess 5w40 SL 3.92 x
Pennzoil Platinum Synthetic European Formula 5w40 SL 3.9 x
Redline 5w40 SL 4.6
Quaker State Q European Formula 5w40 SL 3.9 x
Schaeffer Supreme 9000 5w40 SM 4.57

This is from their site. Not a good paste but shows you some of the numbers/acronyms.

If you do some research you will find that the recommended ZDDP level for oil in our engines is .12%. The minimum API requirement is .06-08% which is noted by an SM. Mobil 1 0w-40 just meets this minimum. While the Porsche approved Euro blend Castrol 5w-40 is SL which is .118%. This is only one attribute but shows that Mobil 1 Euro Blend is actually inferior to most oils. This was not always true but Mobil re-engineered their Euro blend several years ago I believe due to EPA and cost considerations.

The thinner quality of Mobil1 0w-40 is alright initially given Porsche's warning about thicker oils. However, Mobil 1 wears considerably over short periods of time. That is why many using it experience a lot of "oil consumption" as the oil actually becomes too thin. The lower viscosity could also be consideration in seeping RMS's, IMS bearing failure, and IMS shaft failures.

Jason