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I'll jump in, the car is a manual 2008 911 C4 S, I purchased in March 2023. The previous owner did a 5/40 Mobil 1 oil change in October of 2022 with 19,995 miles on the clock. when I purchased the car, it had 21.939 miles on the clock. I added a quart of 5/40 Mobil 1 at that time since the oil reading I got showed oil was at the minimal level. I'm not real confident on the readings I was getting the first few months of ownership, but that's another story and I'll spare you the discussion. The Blackstone report is basically self-explanatory. The comment from Blackstone says no signs of poor wear and attributes the viscosity findings to city driving, I do not drive the car in the city per se, it takes me 5-8 miles and some stop lights to get to the fast roads, but that's it. Perhaps the previous owner did a good amount of city driving. Open for comments, wear metals, other elements, viscosity? Thank you.
M1 is almost a SAE 30 grade straight out of the bottle before it even shears so no surprise your oil is so thin. Blackstone's comments tend to be nonsense and their fuel dilution measurement isn't accurate. Your wear levels are pretty high not surprisingly.
Is there a reason for not using Liquid Moly, Mutol, etc...?
Yep, because the UOA reports don't look as good. Certain formulations of LM show considerably higher bearing wear metals. Motul is pretty good, just not as good.
For anyone that wonders whether time or mileage is the critical factor for oil change intervals...
it's MILEAGE!
I was especially interested to see this DT40 UOA report that I just received back because my Cayenne Turbo S really only gets used for family vacations and an occasional trip, so it took us 27 months to add 5k miles to its clock this time. I've always thought that mileage was more important than time and decided to do my own test of that theory so let it go this long on purpose and to not unnecessarily replace $150 worth of oil.
Well, as you can see from the analysis, it's almost identical to the other 5k mile runs in metal wear and other factors. Based on this, I have no concerns about 12, 18, or even 24 months on an oil change that ends up somewhere in the 4-5k mile interval, at least with the superb Driven oils I use in my cars, and looks like Blackstone agrees.
Interested to see my next one too as this being a DFI engine, I've changed to Driven DI40 in my DFI cars (this one and Audi Q5) since it's specifically formulated for DFI engines with less fuel absorbency and to prevent LSPI - check back in 18-24 months
I'll have an analysis to post in about another month or so to compare. I do yearly changes with about 2500 miles on each. At this time last year, I switched from M1 5w50 to DI40. 8 qts out, 8 qts in. I had decent numbers with the 5w50. it will be interesting to see how the dI40 shakes out. I have a yellow car and I have noticed a lot less soot/carbon on the rear bumper between washes since changing to the Driven oil vs the M1
I'll have an analysis to post in about another month or so to compare. I do yearly changes with about 2500 miles on each. At this time last year, I switched from M1 5w50 to DI40. 8 qts out, 8 qts in. I had decent numbers with the 5w50. it will be interesting to see how the dI40 shakes out. I have a yellow car and I have noticed a lot less soot/carbon on the rear bumper between washes since changing to the Driven oil vs the M1
Cool. If you didn't do a flush with BR40, then don't pay too much attention to this first sample and focus on the next one. When I change to Driven oils in my cars, the first sample.looks noticeably better but I continue to see improvements for the 2nd and 3rd one before things stabilize at the low numbers. This Cayenne is a perfect example with the original analysis on Mobil 1 Euro formula that was in it when I bought it.
No flush, just swapped the M1 for the DI40. To be completely transparent, the M1 5w50 numbers were pretty decent. Just lowish moly numbers that I didn't like. It did have higher fuel dilution than I thought it should.
Here is my most recent analysis. Little concerned with the high silicone levels. Maybe I got the cap dirty or something. My iron levels went down from 8-5 with similar miles. Here is my last report with its first season of Driven DI 0w-40.
Here is my most recent analysis. Little concerned with the high silicone levels. Maybe I got the cap dirty or something. My iron levels went down from 8-5 with similar miles. Here is my last report with its first season of Driven DI 0w-40.
Did you have any work done to the car that would have involved reapplying silicone-based sealant? I noticed you were using BR30, a break in oil, at your last OCI. What work was done to the car? Engine rebuild? Or were you just using it as a "flush oil" when you switched oils and no work was done?
The elevated Si levels are strange as they are certainly not cylinder bore accompanied by much lower levels of Al. Have you changed your air filter?
Glad to see an actual value of .81 for fuel dilution rather than just "negative". If you look at post #556 from above the UOA from 7/19/23 does not have a value for fuel dilution, only "negative". I am not sure if this was a mistake from Speediagnostix or why it wouldn't've actually show a value but glad to see the actual value again on the report.
That’s why I posted the second oil analysis. I did not use the flush, error on the report. I used the Driven DI 0w-40 for my first oil change since owning the car. My last one was only had 1 silicon. No engine work or anything. Changed the air filters 2 years ago and will change it next spring season. Maybe i got some dirt on it.
Have you asked them to confirm the number? I had a similar situation with them a couple of years ago and it turned out the Si value shown on the report was wrong. Worth asking especially since it looks like you have other mix-ups going on with your various reports. I personally would prefer they correct the report rather than keeping bad reports with false history.
09-06-2023, 09:52 PM
