rnl

It’s A40

5W40 Pento High Performance II Engine Oil (5 Liter) - Pentosin 8042206

Jack F

What is piquing your interest in this specific oil?

rnl

I believe that the original fill coolant is from this manufacturer. Just curious. I currently use Motul 5W-40 in the car

barncobob

then why is there a BIG Mobil 1 sticker on bottom of rear lid.

Jack F

Xerex was listed as OEM coolant supplier for the 991.2 according to a few sources I saw.

Jack F

rnl

I’ve participated in this forum for over a decade. Not everyone is an automotive genius all knowing car savant. I certainly am not. I posed a simple question and for the most part the responses were, at best non-responsive. At worst sarcastic drivel.

to the extent I have offended anyone with my ignorance, I apologize

rnl

because the original fill oil was Mobil 1. Yes. I know. I’ve owned the car since June 2012. I had referred not to original fill oil, but the stuff I thought they poured into the cooling system. But thanks for reminding me.

rnl

my sincere apology. I own a 991.1. I would not even venture a guess what was originally installed in a later model.

Wayne Smith

Oil threads are a classic.

If you go over to the 997 Forum you'll find the gurus have shifted to Driven DI40, and it would seem to be for good reason when looking at a myriad of Used Oil Analysis results that have been posted. But this lacks a few of the ingredients to qualify for the A40 listing. It is a designer oil. The formulation is set to reduce LSPI in our DFI motors. Reducing LSPI is important to minimize main bearing and journal wear, which is the most likely problem on our 9A1 motors, excluding cold seizure and chain guides. Speaking of cold seizure, immediate drive off after starting and 3K rpm max with light throttle until the oil has reached temperature. Speaking of chain guides, cut your filter apart when you change your oil and look for bits of plastic.

Note ... You'll find discussion on Driven DT40 as well in the 997 Forum. But to avoid confusion, that oil is for the 997.1 with M9X motor. The 9A1 with DFI in the 991 cars wants the DI40 product.

Now that we've blown this into a full blown oil battle, let me clarify ...

I have no affiliation with any oil.

My 997.2 C4S PDK used Mobil One 0-40 for 135K miles.

I then switched to LiquiMoly 5-40 plus a can of MoS2 additive. Now at 155K miles I'll soon be switching to DI40 without additive.

Why the changes? Boredom? Curiosity? Who knows. But the change to LiquiMoly allowed my motor to run more smoothly. Was it the MoS2, you may ask. Well, backing up, the last Mobil One change had MoS2 as well. Yet the motor was noticeably better with the LiquiMoly. So what happens with the DT1? I'll know in another month. Lake Speed believes in this oil, and I respect his opinion, which tends to be scientific.

YMMV needs to be emphasized here, and I absolutely am not saying you must use any specific oil. Just change every 4 to 5K miles (the UOAs all indicate viscosity breakdown starting before then and wear metals increasing rapidly after that mileage regardless of the oil manufacturer) and watch your UOA results. Then share.

IXLR8

If you are referring to forums and YouTube, don't I know it, but then, neither are vendors.

As I have never had an oil related failure in my almost 50 years of cars and motorcycles ownership and some putting out 190 HP per liter, I just use what is recommended in the Owner's Manual. Amazingly it seems to work.

Porsche_nuts

Being a member for so long, you should know that even the most mundane question does not escape ridicule by some.

IRunalot

Now I'm going to go hunt down this oil thread. Lake Speed jr sold me on Di-40 as well and have used it for the last two oil changes.

AdamSanta85

IIRC BMW uses Pentosin as an OE oil. I've heard its good.

rnl

thanks.