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Good question. The only change was adding MoS2 (one pint which is a bit under the recommended add quantity for a 7.5 quart fill).
Edit: Others on this Forum have noted shearing problems with Mobil One oil and I suspect this is the case. But I am a bit surprised that Blackstone didn't call it out as such. How much lower a viscosity are you going to get from 0-40?
I've used the same oil for my last 20 changes. I have just recently started adding the MoS2.
ive tried several oils over the last ten years and I have noticed the lowest aluminum and silicon wear with the Mobil 0w40 which is obviously what most of us are interested in. Like yourself after 8k with M1, my viscosity was in the 11s, so as others have noted its probably best to stick to 5k drain intervals.
And thanks to WJK for the table.
Here's a few 997.2 and 997.1 examples for comparison...
Karl.
That's a great compilation you've put together. I'd like to point out that the oil with the highest ZDDP levels (Zinc & Phosphorous) also had the best viscosity index, which is the reason I run this oil. Those components are what make up the anti-wear additive package and the viscosity not breaking down means the oil isn't shearing down to a thinner grade. It's also not a difference in 0W vs 5W oil as the 210 degree F viscosity all the oils in the above table are 40 weight when hot, so a direct comparison. At the 100 degree mark, you might see some viscosity differences related to the 0W vs 5W differences. Mine was one of the lower mileage (though not the lowest) change intervals as well, which could also be a factor.
Wayne, that's a great looking report with respect to wear metals and the only thing that stands out is the slightly low viscosity. If you want to continue running that same oil you've used for quite a while,maybe run the change interval to 4,500 miles and see if the viscosity number improves. If you start tracking that, you may be able to determine a mileage interval for your particular motor where the Mobil 1 starts breaking down so you can change it prior to that mileage number. From your report, with the low wear metals, it looks like the Moly you added has prevented wear even with the oil breaking down some (lower viscosity). What we can't really tell is if adding the moly may have contributed to the lower viscosity stability. Those unknowns are one of the reason I don't add foreign chemicals in with my oil and prefer to use an oil that has a complete protection package. I'm not saying if that's a right or wrong viewpoint, it's just mine.
And why would Motul and Driven use such little Boron? Wouldn't all these oil makers be converging on a single best oil for say global use in sports cars?
It was like only ~5 mins of searching, and 10-15 mins of typing -- easy peasy...
If anyone else has or knows of other 997 UOA reports, just post them here (or provide the link to the thread), and I'll periodically add them to the table above.
The only thing I ask is that they be Blackstone reports for reasons of sheer laziness. I know there's other perfectly good (and possibly even better) testing companies, but I'd prefer not trying to build a table that tries to merge different reports from different sources -- could get messy.
Also, it helps that when comparing reports, they're from the same source with the same processes/equipment/calibrations/workflows/etc.
And then for reference, here's where I've pulled from so far...
03-27-2020, 07:46 PM
Another oil analysis
