Mobil 1 ESP (SQ rated) 0W-30

[Hohn]

I was too worried about that a month or 2 ago when changing the oil in my 2.7 Silverado and went with the ESP 5w30.

I hear over and over again how Calcium causes LSPI and the fact that it was API SL worried me.

It takes a certain concentration of calcium to have LSPI effect. The LSPI concerns are with legacy formulas where calcium would be 2200-3400 ppm. Calcium-based formulas now can meet LSPI test requirements because the total calcium level is reduced. Combine that with lower phosphate levels and you have calcium coexisting with no lspi.

 

[unkillsam]

It takes a certain concentration of calcium to have LSPI effect. The LSPI concerns are with legacy formulas where calcium would be 2200-3400 ppm. Calcium-based formulas now can meet LSPI test requirements because the total calcium level is reduced. Combine that with lower phosphate levels and you have calcium coexisting with no lspi.

So it meets the bench test requirements despite the calcium? But isn't API SQ because of the higher ZDDP? Am I understanding that right?

 

[Hohn]

So it meets the bench test requirements despite the calcium? But isn't API SQ because of the higher ZDDP? Am I understanding that right?

No, it meets ENGINE test requirements. The LSPI test is in an actual running engine.

API SQ has certain concentration limits within the formulations. 800ppm max Phosphorus, 0.9% SAPS maximum, Sulphur, 0.5% for 0w and 5w grades.

The rest of the API SQ requirements are performance based. Which means that if you can pass all the performance tests but do not meet the chemical constraints, you have the situation of the ESP formulation-- it meets "engine test requirements" for API SQ, but because it busts some of the chemistry limits of the spec, it cannot be said to be fully API SQ compliant and cannot carry the "donut" for API SQ.

 

[unkillsam]

No, it meets ENGINE test requirements. The LSPI test is in an actual running engine.

API SQ has certain concentration limits within the formulations. 800ppm max Phosphorus, 0.9% SAPS maximum, Sulphur, 0.5% for 0w and 5w grades.

The rest of the API SQ requirements are performance based. Which means that if you can pass all the performance tests but do not meet the chemical constraints, you have the situation of the ESP formulation-- it meets "engine test requirements" for API SQ, but because it busts some of the chemistry limits of the spec, it cannot be said to be fully API SQ compliant and cannot carry the "donut" for API SQ.

Hmmm.....so I could consider switching to the 0w30 ESP then. I was very worried about the LSPI considering the 2.7 pushes 27lbs of boost and it loves to lug (tuned that way) at super low rpms.

 

[buster]

You won't have LSPI issues with M1 ESP.