API SL/SM Spec in the middle of SN era

Well, that’s when it was harmonized - R&D started in 2011 and individual formulators started dealing with it. Buster has mentioned how far back Mobil 1 did …
Dexos 1.2 is a 2015 release …
Around 2012’ish is when Mobil went to Ca/Mg LSPI friendly additive system.
 
Are those looking for GDI soot? Because my understanding is that GDI soot is considerably finer than diesel soot, I posted the size specs on here some time back. So that number may not accurately reflect both the volume, and subsequently the effect that GDI soot has on engine parts.
Because a UOA would not be able to see the particles?
 
Because a UOA would not be able to see the particles?
Because whatever they are using to determine the soot percentage would traditionally have been calibrated for diesel soot and I was curious as to whether their recommendations and observations might change if it was GDI soot, based on the studies I've read on GDI soot, which has different properties.

ICP (how they determine the metals) isn't used for the soot part of the test, they use FT-IR:

This practice is based on trending and distribution response analysis from mid-infrared absorption measurements. While calibration to generate physical concentration units may be possible, it is unnecessary or impractical in many cases. Warning or alarm limits (the point where maintenance action on a machine being monitored is recommended or required) can be determined through statistical analysis, history of the same or similar equipment, round robin tests or other methods in conjunction with correlation to equipment performance.

To derive a percentage based on mass.

So, given that GDI soot appears to be finer, I'm curious as to how that applies to things like wear, since you'd have considerably more particles in terms of count with the same apparent mass, relative to coarser diesel soot, which also can get picked up by oil filters, whereas, according to one of the studies I've read, GDI soot will pass through the oil filters.

Probably a question best directed to Polaris really.
 
Hi.
Is it possible to mix API SM and API SN in one engine? Is it possible that additives create some particles (such as oxides or salts) that can damage the engine? I am from Europe and API SM is hard to find.
Thank you
 
Hi.
Is it possible to mix API SM and API SN in one engine? Is it possible that additives create some particles (such as oxides or salts) that can damage the engine? I am from Europe and API SM is hard to find.
Thank you
All API licenses are miscible per the license requirements.
 
iirc, no guarantee that the mixture will retain licenses or approvals that the original oils had. Specifically the winter rating and may degrade additives performances ... But it won't blow up your engine. :ROFLMAO:
 
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