breale01

Back to M1 15W-50, but 'SM'. Not the old 'SL' that everyone loved, but it still has 1200 ppm ZDDP versus the Porsche approved M1 5W-50 at 1000 ZDDP. No additives required.

elbeee964

Who'd have thought 'Porsche approved' would become a pejorative re motor oil?

Vandit

What brand, type, and weight do you all recommend for a car that's going to be used in Texas heat?

Shamus964

I'm just using some stuff the guys up the road can get... of course I'm lucky enough that the guys up the road are named Gamroth and Weiner so it's Brad Penn.

falcor

Motul 300v 15W-50

perlfather

Even as a frequent "contrarian" I continue to be amazed to see intelligent people assume:
1. a technician with virtually no scientific basis knows more about oils than research and lubrication approval organizations of Mercedes-Benz, Porsche, BMW, Volkswagon and General Motors
2. Simply more ZDDP is better (if that is the case why does Mobil (and brand X) not just increase it to 3000+ppm on all the grades) obviously there are trade-offs.
3. completely disregard the befits of a 0W.. oil for starting in moderate climates and typical driving conditions (not on a track) of the majority of Porsche drivers
4. Assume that if Mobil states that one particular oil "Provides maximum protection, even during extended-use driving. It meets performance specifications of most carmakers, including Mercedes-Benz, Porsche, BMW, Volkswagon and General Motors" they are not telling the truth and one of their other formulations must be better.
Finally since none of us change the non synthetic oil every 15,000 miles (as our owner manual states), do not drive at 150mph, close to red line for hours at a time (as many did 20 years ago on the much less dense autobahns) we are worrying about the wrong lubricant. my $0.2

Ritter v4.0

Some valid points by degree, but the last one is way off for some, maybe even many here. Every weekend some of us drive on track for up to 3-5 hrs routinely shifting at redline and hit 150mph+ every minute and a half or so.

Laker

a-hem..... No idea what was in the car prior to last week. Currently has fresh Brad Penn 20W50 and a Mahle OC54 filter. Next several oil changes will be using the Valvoline VR1 20W50 dino. I stockpiled recently.

Navaros911

Bard Penn 20w50... I have it shipped from the USA to the Middle East... I am probably paranoid.

In the winter I mix three quarts 0w30 in there... it's always hot here.

perlfather

Have a look at this site with lots of answers based on pretty good data
http://www.bobistheoilguy.com/cms/in...tpage&Itemid=1

jeffy911

Am I the only one that runs Castrol 20/50? I have always used that in my 90 C2 and Dinan 3 BMW

Makmov

That is what I just used in the C2 Castrol GTX 20W-50

although they say it has been reformulated and doesn't have the phosphorus and zinc it once had.

Castrol still claims it exceeds any API manufacter's warranty requirements.

My C4 needs changed and don't know what I will use in that.

“If a consumer has a modern car or is simply mentioning the article and has questions about the lowered ZDDP levels”:
Thank you for contacting Castrol North America.
As indicated on our product packaging, the current engine oil category API SM/ILSAC GF-4 is fully backwards compatible or ‘back serviceable’ and has been extensively tested. Valve train issues are not anticipated with the use of modern engine oil in older cars of OEM stock configuration. In fact, current
SM/GF-4 engine oils are subjected to testing that is far more intensive than engine oils of previous API/ILSAC categories.
To clarify, in general, ZDDP levels have been reduced a small amount in the current category engine oils (API SM/ILSAC GF-4) in compliance with industry regulations that set maximum levels of Sulphur and Phosphorus, but are still at levels that provide ample engine protection.
Special procedures have always been recommended for the proper initial break-in of a new, matched, cam and lifter set; which include the use of a properly formulated cam break-in lubricant paste which typically contains a healthy dose of molybdenum. Engine oil alone is typically insufficient for break-in of a new cam and lifter set, particularly in a vintage engine type built to historic specifications.
In regards to camshaft failure, Camshaft failure can be attributed to numerous possible causes. Only a thorough analysis of each case can identify the root cause(s) of any failure.
We trust this information addresses your concerns.
Thank you again for your interest in Castrol, The Technology Leader!
Castrol Consumer Relations
“Response for consumers who have an older performance car with flat-tappet cams, are angry with Castrol and who believe wholeheartedly in the truth of these articles, and want alternate oil recommendations”:
Thank you for contacting Castrol North America.
Castrol is aware of articles in enthusiast magazines and web-sites, as well as after-market parts manufacturer discussions concerning GF-4 engine oils and cam-shaft durability issues in older performance vehicles, and we sincerely regret that this has caused you concern.
Some consumers suspect the lower level of ZDDP in GF-4 oils may be causing these failures. Castrol is currently investigating this issue.
If you do not wish to use a GF-4/SM rated oil in these vehicles, Castrol does offer the following products that contain Zinc at a level that is higher than the Zinc level found in oils (API SG) marketed during the "muscle car" era of time:
* Castrol GTX 20W-50 (SL,SM)
* Castrol GTX Diesel 15W-40 (CI4,CH4,CG4,CF4,CF,SL)
* Castrol GTX High Mileage 20W-50 (SL,SM)
* Castrol HD 30 (SL,SM)
* Castrol HD 40 (SL,SM)
* Castrol Syntec Blend Truck 15W-40 (CI4,CH4,CG4,CF4,CF,SL)(Semi-synthetic)
* Castrol Tection Extra 15W-40 (CI4 Plus, CI4,CH4,CG4,CF4,SL)
* Castrol Hypuron S 15W-40 (CI4 Plus,CH4,CG4,SL)(Semi-synthetic)
The following Castrol products have Zinc levels that are typical of API SG oil:
* Castrol Syntec 5W-40 (SL,CF)(Synthetic)
* Castrol GO! 10W-40 Motorcycle Oil (SG)
* Castrol GO! 20W-50 Motorcycle Oil (SG)
* Castrol Grand Prix 4-Stroke Motorcycle Oil 10W-40 (SG)
* Castrol Grand Prix 4-Stroke Motorcycle Oil 20W-50 (SG)
* Castrol TWS Motorsport 10W-60 (SJ)(Synthetic)
Please remember that if you are installing a new performance cam in an older performance vehicle, it is important to:
* follow the installation recommendations provided by the cam manufacturer
* use the recommended cam break-in lube
* prime the engine oil circuits
* use the recommended engine oil
* confirm valvetrain geometries prior to starting the engine with the new cam
We trust this information addresses your concerns.
Thank you again for your interest in Castrol, The Technology Leader!
Castrol Consumer Relations

oldporsche

I was told to use Mobil One 10/30...yr round.
This is from a very reputable Porsche shop.

rarebear

10W40 semi synth ACEA 3 spec, Shell Helix,
no 150 mph redlining in the Netherlands, we are happy doing 50 with peaks to 80,
at 80 I am happy as a squirel hunter bagging a mountain lion. LOL
Most of the time we have traffic jams.

spanky

I am using Mobil 1 Twin V 20/50 in the 951 and the 911, Mobil 1 15/50 and Mobil 1 Twin V 20/50 in the 944, 50/50 blend. Have never had a oil related problem.