StudGarden

I tend to lean more towards the 0W40 for slightly better start up protection, which is where the bulk of wear occurs especially for a DD. Found this on the internets. Its about MB but the principle should apply.

http://www.mobiloil.com/USA-English/...edes-Benz.aspx

BradB

Any predictable way to estimate the degradation? With past Porsches I have changed the oil twice a year. Less than 5000 miles, but perhaps a dozen track days. I've always used Mobil 0w40.

LexVan

Do UOA's. Maybe even pay extra for TBN's.

12 track days on Mobil 0W40? Wow, that's asking a lot, Brad. Cut that in 1/2. And use a 5W40 oil. And one of the oils I referenced above.

Dude174

Not surprisingly there's a huuuuuuge thread on m3post about oil and the thread started about premature bearing wear. A lot of people speculate it's because the spec 10w60 castrol tws is too heavy at startup and the oil has hard time getting by tight tolerances etc etc

Anyway, the reason I reference this, one of the posters is an engine builder for Hendrick racing and this led to bearing tolerances compared oils - then referenced better choices such as Mobil 1 0w40 among others. There's also tons of data on bobistheoilguy. Basically the euro spec 0w40 is significantly better than "regular" Mobil 1? I think he also referenced motul and a shell synthetic diesel oil (I don't remember).

I think lexvan is right, it's best to have it sampled and go off that, especially since we can't even see our oil until it's drained! He never mentioned joe gibbs oil but that's probably because Gibbs is a competitor to Hendricks.

BradB

I would do one of my oil changes mid summer to split up the number of track days on the same oil. Gee, I thought that was doing pretty good.

Excuse my ignorance, but it don't know what UOA and TBN stands for. (EDIT: I just went to Blackstone labs and learned what the acronyms stand for. But it sure is confusing!)

Mondrian

For the record its not 0F but C as 0F equates to -17.8c.

0 - 40 should be better for engine as it reduces wear at cold starts and 5-50 should be better for oil as it reduces degradation (of oil) at high temp. So if you live in a cold climate and aren't tracking the car then 0-40 but on the other hand if you're pushing the car or in California then 5-50. Either way differences are not so much that would concern me.

In the old non synthetic days we used to switch oils between summer & winter.

CSK 911 C4S

Don't worry about me. I'm probably going to have the highest mileage 2013 911 after a few years. I'm not a show and shine person, rather be zipping along some back road somewhere.

With the CPO warranty I'm not worried about stuff breaking but I do like taking care of my equipment.

kosmo

id agree that 12 track days is prob too much

cvazquez

I track 4x yearly and use Mobil 5w50. Most tracks are Florida locations...

chuck911

Thanks for the link. The list to the left covers a lot of topics people have been posting about….. with Mobil giving somewhat different advice. People might want to check it out.

LexVan

Great oil. I plan to switch to this oil at my next oil change (Sept.). Ran it in other Porsches. Always had excellent UOA's. Hard to find retail, actually impossible. But I have an account with the local Mobil distributor. Can buy a case (6) for about $46 and local pick-up. Not bad in the life of boutique oils.

BradB

You're right. I searched all around for the Mobil 1 5w50 and it is hard to find.

BED997

I have been able to source at Napa. It typically goes on sale in the spring with a mobil 1 coupon.

John's 991

Amazon carries it for $56 per case of 6. More than LexVan, but not unreasonable.

BradB

Thanks guys, I found those sources. I think I will change my oil with the 0w40 I have on the shelf, then run a Blackstone test, and see how it reads. Perhaps next time I'll get the 5w50.

I wonder if 15w50 would work for the summer months? I run that in my 993 and it is readily available and cheap.

In the end I'll run what's best. Too much of an investment to squabble over pennies.