Did Lake offer an explanation for the 154 Magnesium? Unless possibly the previous owner was running an oil with it and there's just cross contamination. If you had been running DT40 or DI40 before that and there's no cross contamination I don't understand that high of a value unless possibly it's related to the special upgrades your engine got.

Also if I recall you recently got new injectors but I see your fuel dilution doubled, jumping up to 1.9% in the 8/21/23 most recent report -- is that with the new injectors? it is weird because your fuel dilution is twice as high as the previous sample but your wear is half (usually fuel dilution is highly correlated with wear metals). It's also weird your oil viscosity is better with the higher dilution.

 

Magnesium level was never discussed. Here are the 2 pre injector replacement reports and the 1st post replacement. Disregard the silicone spike, I used the wrong collection bottle and it leached into the sample apparently.

 

haha ya I remember that about your Si It is sort of weird though that your most recent report went to 1.9% fuel dilution... those should both be summer blend fuel looking at the dates making it even more strange.

EDIT: for anyone that comes along reading this later, based on another thread it seems highly probable that this was due to the HPFP

 

I'll finally add mine to the mix. The last oil change was DI40. I finally made the switch and everything has improved. The first OC was M1 0w40 I believe. The subsequent changes were M1 5w50. All had mediocre fuel dilution levels.

The DI40 had better wear metals across the board, more moly, and better fuel dilution. This is with probably a couple quarts of 5w50 mixed in because you never quite get all of it out. Next change should be even better.

It's a PDF, if someone can convert it somehow and post it here, please do.

(Petza914 - added UOA report per user request)

 

I’ll add mine if the case of Driven I ordered in September every ships…. I want to see if my fuel dilution improves since I replaced new injectors.

 

Report looks good, wear should decrease in subsequent OCIs. Considerable cross-contamination which explains the lower than usual viscosity for DI40, mine is always 14.0 cSt or thereabouts, it doesn't shear. Highly doubt your fuel dilution is <.5 in a 2012 DFI but it's only an approximation (I bet it's at least double that in reality). I am assuming these are street miles, not track miles. You can run DI40 longer than 1,600 miles on the street if you wanted to. It was smart to short change it into an oil switch though, so strong work on that.

 

Where did you buy it from? I've had a few cases delivered since then - FR50, DT50, & DI40

 

Oddly enough, directly from Driven when they had a sale.

 

Agreed with all. I would imagine even with the suspect fuel dilution numbers, it's still better than the M1. Yes, all lively street miles but I'm not afraid to take it to redline. Sounds too good. I change the oil every October or November, right before storage regardless of miles. Sleeps with fresh oil every year. As pricey as it is, I believe the Driven oils are worth the extra cost.

 

That's where I bought mine too, but I think during Black Friday / Cyber Monday - 5.pr 6 cases came like 4 days later.

 

Well that’s definitely weird. After I ordered and yours came in days later. I’ve contacted them twice and was told end of October the first time and end of year the second time.

 

Oil finally came in this week, only 4 months later. I can finally change my oil now. Will post results and see if the new injectors helped improve fuel dilution. But it seems that there may be some inconsistencies on how SpeeDiagnostix is reporting it now. I think silver_tt mentioned he’s seen some that just show a general good or acceptable type reading versus the percentage that was previously reported. Also, I better place another order for the next change now.

 

Sometimes Speediagnostix is making mistakes on the reports and/or commentary. Recently in the "2005 3.8S Engine Rebuild" thread a UOA was posted with wear of 45 / 1,000 and the commentary said it all looked great. No, no no... Even on a tracked car this level of wear is unacceptable and should have been flagged and this was corroborated by the fact that the rod bearing were toasted on the tear down. They need to implement controls and more rigorous standards in their reporting.

Looking at post #566 the UOA from 7/19/23 the report just says "Negative" for fuel dilution. If this was my engine I would have emailed Lake back right away and said to send me the %, I am not interested in a binary positive/negative especially since they didn't even consider if the engine was DFI or not. This is very disappointing because I know Lake is knowledgeable in this area and he knows better than this. All the testing and his data he talks about in the lab surely must have been done under more rigorous standards. Sloppiness is the enemy of good science.

Looking at post #612 AAA-4274 UOA from 11/7/23 you can see it's back to a % again. This leads me to believe Speediagnostix just made an error, maybe they copied and pasted a cell in Excel on accident that is my best guess but who knows....that is speculation on my part.

That being said Speediagnostix is still the best service available due to the technologies used. You just have to keep your eye on them....this thread is good for that.

 

Hello all,

I will add my oil anaylsis to this thread, since this is probably the most comprehensive oil sample analysis on an Rennlist sub forum. To be clear it's a 991.1 GT3 RS, with the oil that I bought the car with. A porsche dealer did the last oil change, so I would assume Mobil 1 0w40 Euro, but Blackstone disagrees.

I changed it to Mobil 1 5W50 FS X2 Euro. The advice I need is what oil next. I am debating between Driven DT 40, DI 40, or FR 50. The 991.1 GT3, and to a lesser extent RS suffer from Finger Follower Wear between the Finger Follower and the Camshaft. On the oil regime stribeck curve, it's a low speed, high load application, so boundry layer / addtive important. Likewise, high oil shear strength is important. My application is spirted road driving on weekends, started in 50F +. The GT3 engines shear the heck out of the oil with their 9k redline. Oil will be changed less than every 2500 miles.

DT50- High ZDDP, Moly, lower HTHS, than DI40. DI40 has lower ZDDP, lower moly, but actually higher HTHS. FR50 appears to be DT50 with a higher viscoity. I really like the FR50, but I want to take advantage the FCP euro oil change life time options. However, if FR50 is going to help, I would consider it, but it seems very thick compared to a regular 5w50.

Driven themselves recomened DT40 for the A40 application. Lake Speed JR, recomended DI40. What say y'all?

Thanks!

I'll also attach some A40 application possilble virgin VOAs. Before the driven DT40, I was also comparing Mobil 1 SuperCar 5w50, Mobil 1 FS x2 5w50, Motul 300V, and DT50.