API SL/SM Spec in the middle of SN era

[YZJB]

Wasn’t SN where they started getting serious on LSPI?

No. SN Plus and then SP.

SN had no LSPI mitigation factored in to it.

 

[4WD]

No. SN Plus and then SP.

SN had no LSPI mitigation factored in to it.

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 …

 

[buster]

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.

 

[burbguy82]

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?

 

[OVERKILL]

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:
https://www.eoilreports.com/testPopUps/soot.html

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.

 

[MarkMax]

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

 

[kschachn]

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.

 

[burbguy82]

All API licenses are miscible per the license requirements.

Without a reduction in performance? Such as 5w40 mixed with 15w40?

 

[userfriendly]

This oil probably has more phosphorus containing compounds like ZDDP than SM or higher allow, hence the SL rating.

You might be on to something.
www.acea.auto

www.oilspecifications.org

 

[MarkMax]

Without a reduction in performance? Such as 5w40 mixed with 15w40?

Of course not. SAE will be the same.

 

[kschachn]

Without a reduction in performance? Such as 5w40 mixed with 15w40?

That wasn't the question, and API licenses aren't directly related to grade anyway. Miscibility definitely is not.

 

[burbguy82]

That wasn't the question, and API licenses aren't directly related to grade anyway. Miscibility definitely is not.

All API licenses are miscible per the license requirements.

So mixing would not be advisable between grades? Would that not be more accurate? Am I understanding that correctly?

 

[OilUzer]

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.

 

[Jetronic]

But yet nearly all of the GDI UOAs we see (that are measured by good labs) have soot at 0.1% or less. That’s 10ppm. I find it hard to believe that alone would cause the number of failures reported.

0.1% would be 1000 ppm

 

[Jetronic]

Without a reduction in performance? Such as 5w40 mixed with 15w40?

no, it will still be oil (not turn to wax or gel) and it will stay mixed but there's no performance guarantees.

 

[mobilnissan1991]

Id like to use the Castrol Euro 5W30 SL for one good run before I switch to HPL in my 2012 F150 that has the 3.7 Cyclone, just to compare UOAs
Im assuming the oil would be fine to use and is it suitable for long ocis?

 

[edyvw]

Id like to use the Castrol Euro 5W30 SL for one good run before I switch to HPL in my 2012 F150 that has the 3.7 Cyclone, just to compare UOAs
Im assuming the oil would be fine to use and is it suitable for long ocis?

Edge 0W30 is step up and SL. Available in AZ and AAP.

 

[edyvw]

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.

Few years back I think I had 4 different oils in BMW.

 

[OilUzer]

Edge 0W30 is step up and SL. Available in AZ and AAP.

I like the 0W-30 better but they were about $9-11 per quart last I checked.

I recently bought another 5 qt jug of Castrol Euro A3/B4 5W-30
for ~ $23.

 

[edyvw]

I like the 0W-30 better but they were about $9-11 per quart last I checked.

I recently bought another 5 qt jug of Castrol Euro A3/B4 5W-30
for ~ $23.

It goes on sale $37 for 5qt plus filter.
If you go Euro from WM, go ESP 0W30 or 5W30.