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.