Kevin

Do you have a Typo>>5W30.. You will shorten the life of your engine with the 30W... We are trying at all costs to prevent the 40W to sheer into a 30W..
If this is what you have in your engine>>drain it and refill.
FYI your 3K VNT turbochargers HATE thin oils. You will TRASH the thrust washers and thrust bearing stack in short order! You lose the oil film which causes the brass thrust bearing failure (our turbochargers already have an issue with this)

Happy Fourth...

Skwerl

Isn't a 30-weight way too thin? As a matter of fact, researching for this year's oil change (aka reading Kevin's posts) has me convinced to try Motul Sport 5w50 because the higher viscosity is less likely to shear to a lower weight and cause issues with the turbos.

Edit: Speak of the devil, he confirmed my research as I was writing my post!

atcbi5

So is it 50w or 40?

Kevin

Who's on First...

It's the Blend 2.5W45 >>half 0W40 and half 5W50.. LOL

Tmistry

Forgive me. 40W.

What's too thick? I run 20W-50 in my air cooled. Too much?

jeebus31

What kind of issues can you get running 5W30? I ask because the PO of my car apparently used 5W30, this is what I wrote down in my notes back when I bought the car, but I am not sure if that is also a typo/error. Just curious...

Ruskiy

I think all people are saying is that once you’re up to operating temps or especially above after multiple high speed prolonged pulls or track time it thins out and drops down say to 20W instead of 30W... hence why they’re all freaking out over use of 30W. Makes sense to me I guess.

With my “daily” really a weekend 997TT I run Motul 5-40W and now I’ll go up to Mobil’s 5-50W just for that added “protection” I guess. TBH I just want it to run a little quieter is all.

atcbi5

Done!

jeebus31

For sure I get that. I guess my question was more along the lines of what could happen if, say, my engine had been filled with 5W30 for ~65k miles.

Skwerl

Would you advise against just doing all 5w50? I believe Mobil's 5w50 was officially A40 approved by Porsche and I just ordered enough Motul Sport for my next 2 changes.

Kevin

Jeebus, take oil samples and send them to Blackstone. Post your results..

Skwerl.. Motul 5W50 runs thin vs Mobil1 and Redline 5W50. Being in Texas run the Motul 5W50, in the winter below 60F you can mix some 5W40 with 5W50 Sport for a 5W45 ratio.. Send your oil samples in for testing

Skwerl

Just trying to understand, but if the Motul Sport runs "thin," would it not in practice be like a good, stable 40 or 45 that is also resistant to shearing to a lower weight thanks to the esters in it?

I thought the issue with using a 40-weight was that the chain and turbos' heat can shear it to something like a watery 30-weight, making the 50 a better choice because it doesn't get too thin after getting beat up in the Mezger engine.

Kevin

Every oil manufacture product viscosity is different. You have the US SAE standards used as guidelines. Redline oils will typically run thicker in the given published weight and when you look at the Virgin oil sample reports you can SEE the specs >>Vicosity is higher>>so it is thicker out of the botlle.
Mobil 1 synthetic will be a tad thinner than Redline AND thicker over Motul.. We do NOT want to even get close to a 30 weight between oil changes or shall I say around 4K to 5K miles... That when the oils sheer or lose there published weight.
Do your own research.. Look at the published viscosity cold and hot compare them to the oils that you want to run. Compare used oil at 3K miles or 4 k miles or 5K..
Motul is a great oil, the Sport oil at 5W50 is a great choice. For the winter driving season one could bled some 5W40.. My statement is for those that drive thru the winter. I don't..

jeebus31

Switched out the tiny seal, the big seal, and the filter. The housing was pretty much bone dry. Hoping that this solves the hard rattle on start up after sitting for several days.

I'll have to wait for maybe another 800 miles or so to do an oil analysis to get some useful data. Unfortunately I didn't keep a sample of the oil that was in there when I bought it from the PO... too bad.

saabin

I'd say it's gotta help. When I take off my filter I have to use a turkey baser to siphon out all the old oil from the housing..