Rennolazine

Ps the oil interval is closer to 3500 miles through winter storage. Lex I just put in mobil 5w50 will post blackstone for that oil change this fall. Btw the T is tuned so figured the extra viscosity is insurance on the motor. These engines are amazing if driven properly.

LexVan

Classic 0W40 Mobil shearing. The 5W50 is much more robust, and will hold up better.

minthral

Looks perfectly fine and as they stated seems like the engine is breaking in. They never recommended to put 5w50 in... not sure why you're doing that. Just because its tuned and you think its better protection isn't a good reason to use an oil not recommended by manufacturer...engine has a spec for a reason and I can't imagine using heavier oil is a good idea especially during summer...

LexVan

You have a ton of misinformation in your post.

Mobil 5W50 is A40 Porsche approved.

His high temp, high shear viscosities are atrocious. You NEVER want to see below an 11.

Rennolazine

Dont want the oil breaking down on me on track this summer. The 0w40 breaks down very, very quickly. This is only after 3500 miles and maybe only 500 of them were tuned. Going back to a thinner oil for winter but honestly I never drive it in sub zero so it prob wont even matter. Lets see what the next oil analysis looks like.

minthral

Oh nvm I got it backwards...5W isn’t winter when compared to 0W which is what is recommended for these cars. I guess in theory 5W would hold up longer...

Porsche approves using 5W oil instead of 0W in a 991.2 and will honor warranty?

Rennolazine

Yes. There is a list on RL somewhere. Its actually much much longer than I expected

minthral

Nvm there’s plenty of other threads discussing this.

2 cents I would add is my understanding is most wear is during cold starts and its even worse during winter....lighter/less thick oil would be better in this regard. The other side of it is oil degrades after heat cycling and then doesn't lube as well so it needs to be replaced...heavier oil is better in this regard. Nonetheless, the engine is designed to accommodate a certain oil viscosity so it flows through passages and lubricates correctly. OEM specified 0W oil for a reason...would be curious is there is some documentation where they say using 5W50 is okay... in theory I think it would be very similar. Nonetheless the theme is to change oil frequently.

LexVan

There are over 100 A40 approved 5W40 oils.

The only 5W50 A40 is Mobil's. And if you want the "documentation" it's printed on the back label.

kuma1416

I'm sure Porsche has done plenty of oil analyses themselves. Why don't they make 5W50 OEM?

minthral

Best guess is because an oil that works in different climates is required and 5W50 wont work well during winter. They aren't going to design a car and tell people to use one type of oil during summer and another type during winter.

I really doubt engine failure due to wear from not using perfect oil will be the downfall of a car. Typically engine is last thing to go...following OEM maintenance schedule and oil will allow engine to last for the life of the car. Some people are more worried about it than they need to be IMO. Change oil every 1k miles religiously doesn't mean something else wont fail. After 200k miles its going to be an old worn out car and nothing is going to change that.

Rennolazine

I never said it was better. Just curious if theres a difference. OEM worked fine but that was with less flogging, lower ambient temp exposure/heat, and low miles. Scientific research baby. Its cheap

LexVan

Rennolazine, quick question for you. During this last 3,500 miles, did you by chance use any "race gas" that was high octane, unleaded? Maybe at a track event? I suspect you did. I say this because your UOA pinged 1 ppm of lead. I've seen this faint anomaly in the past from the use of race gas, even at only 1 or 2 tanks full. I'm curious to see your answer. It's a non-issue regardless.

I think if you keep using the Mobil 5W50, and keep your OCI to under 5,000 miles, you'll see your major wear metals (Alum., Iron, and Copper) get cut in 1/2, very easily.

Rennolazine

Hi Lex just pump gas 93 octane. I try and use shell every time but occasionally mobil. I did have stabil red in the car 4 months over the winter during the “hibernation” fillup.

Bob Z.

I plan to use 2.5/45 at my next oil change: 4 qts of 0/40 and 4 qts of 5/50.