djm68

Getting prepped for the upcoming track season and have a few questions about oil.

2012 Cayman R (PDK) with LN engineering spin-on oil filter adapter, using NAPA 1348 filters and LN engineering deep sump oil pan; catless headers will come later this year, but stock currently.

Usage scenario is approximately 90% track day, 10% street. I don't trailer (yet), so I do drive to the track, longest drive to a track is about 175 miles (one way).

I am considering:
Motul 300V Power 5W40 Racing Motor (silver 2L can) or
Motul 8100 X-CESS 5W40

I've previously used Motul 8100 X-CESS 5W40, then switched to Joe Gibbs XP9. My only objection with XP9 is the suggested drain interval for my usage is too short -- XP9 should not be used longer than 10 hours of run time, track or road. This makes XP9 infeasible for many of my track events as I drive to the event; 3 hours each way, plus the actual time on track will far exceed the 10 hour run interval.

Any input on either of these oil choices? And, for my use case, a suggested drain interval?
Is there any merit in mixing these two oils?
Would your oil suggestion differ if I had catless headers installed?

Thanks,
DJM

85Gold

Scooby921

******* answer:
What did Porsche specify as the OE oil for your engine? I'd use that one. It's the one they used during development when they tested and certified durability of the engine and components. I'm pretty sure it's the one they had in mind when they decided your car could and should survive the occasional track day.

Somewhat informed answer from someone who works for an OE driveline component supplier and deals with oil and temps:
Monitor oil temp. If it stays below 120°C you aren't doing significant "damage" to it which would justify an increase in oil change frequency. If you do exceed this temp the "damage" is exponential for each 5°C and minute you are over this threshold. If you're over by 5-10°C then you probably want to change it after every two or three track days. If you are over by 20+°C then you want to change it after every event. This is a big reason not to opt for some outlandishly expensive oil. Maybe it changes things by a degree or two on when it starts to break down, but in the end they all come from the same base material and there is only so much you can do to alter chemical and mechanical properties.

Marine Blue

djm68

I assume you mean DT40, correct? What type of track usage does your 987.2 see?

DJM

Marine Blue

PorscheAddict

Oil is like religion, so you're probably going to get a scatterplot of feedback with little proof for any choice. I'm cool with M1 5w50 on track/street, which stays at or under 245F with third radiator.

One note, though, is that the spin on adapter is intended for use with a special re-useable/washable filter for track use. I don't think you're supposed to run just a NAPA filter on track. They are smaller and more restrictive than stock or the LN track filter, which will lower oil pressure.

okie981

All direct injection engines should use oil that has been formulated to eliminate or combat Low Speed Pre-Ignition (LPSI). This involves reducing Calcium, eliminating or nearly eliminating Sodium, and adding/balancing Molybdenum. Zinc and Phosphorous don't come in play with LPSI oil formulations. Also helps (but is not as important as additive balance) to have a Group IV full synthetic base stock with a significant percentage of mPAO (metallocene PAO) base stock. This helps reduce vaporization of the oil in the combustion chamber and forming microscopic droplets that contribute to LPSI. The mPAO also helps reduce vaporization in the crankcase as well and reduces friction slightly.

If you do an internet search for LPSI, you will have plenty to digest. LPSI is a problem for all DI engines, not just turbocharged, but turbocharging makes it much more of an issue. Jake Raby has some videos on his YouTube channel that describe LPSI and how it can cause failures on the 9A1 engines in our 981 and 991 cars. Not saying that it's a major problem, but it's something to pay attention to.

Since you mentioned DT-40, I learned that Driven reformulated the additive package in that oil a couple of years ago to help combat LPSI. I saw a big change in the additive blend in my UOA results and emailed them to inquire.

Any oil that has dexos1 Gen2 licensing on the bottle has been blended to fight LPSI, and also any oil with an API service classification of "SN Plus" in the donut on the back of the bottle has been blended and tested as proven to combat LPSI.

Driven started offering a line of oils specifically blended to combat LPSI, Direct Injection (DI) blends. They come in DI-20, DI-30, DI-40 and I think one thicker viscosity. The DI-40 is "slightly" better than DT-40 for fighting LPSI as stated by Lake Speed when I emailed him about it. I plan to switch to DI-40 at my next oil change. I've already switched my 2018 Denali 6.2L engine to DI-30.

If you have another oil you like and aren't sure of its formulation, investigate. LPSI is a real issue and not to be ignored. Not a crisis, just don't ignore it.

BTW, I was at AutoZone last weekend and when spot checking prices, the Mobil 1 and other name brand products that had SN Plus and/or dexos1 Gen2 were in the $11.50 per quart price range.

Marine Blue

Marine Blue

okie981

Watch this video from Lubrizol. They are one of the few additive manufacturers for motor oils in the world. Note that LPSI occurs below 2,500 RPM. For an engine that is tracked or raced, it rarely will be below 2,500 RPM. Where LPSI is a real concern is for street driven engines that frequently see RPM below 2,500 RPM. Durability and performance in racing conditions is important, but in street-driven high-compression direct injection engines, lower RPMs are where the specially formulated oils targeting LPSI can provide additional protection.


Also see: https://alternatesupercars.com/direc...d-be-your-oil/

And from API, in order for an oil to be classified as "SN Plus" it must have no more than 5 LPSI events during an ASTM test derived for such testing. Scroll down the document and read through it all (look for the red font in the specification sheet):
https://www.api.org/~/media/Files/Ce...7rev021218.pdf

djm68

I am aware people will have a lot of different opinions, I did narrow my question down to 2 specific oils vs. a random 'what oil should I use' inquiry and specific questions about those two oils.

WRT the oil filer adapter: you are confusing the adapter for the 987.1; for the 987.2 application LN specifically recommends the NAPA 1348 https://lnengineering.com/spin-on-oi...yman-only.html

DJM

djm68

Interesting for certain, but lacking relevance considering this thread is about a 90% track usage scenario.

DJM