Originally Posted By: Quattro Pete
Just curious, do all DI engine mfgs acknowledge that LSPI is an issue and agree that low calcium helps prevent it?
Of course, they could just be ignorant and sticking their heads in the sand untill called out on it. I am just asking if we'vw seen any reaction from the engine mfgs to these various industry publications.
Not sure about the engine mfgs, but SAE, Pennzoil and Chevron seem to believe there's a relationship...
SAE study
http://papers.sae.org/2014-32-0092/
Chevron Ornite
https://www.oronite.com/products/lspi.asp
The Role of the Lubricant in LSPI
"Many factors have been demonstrated to impact LSPI, including: engine designs, fuel composition, and lubricant composition. On the lubricant side, the most noticeable impact has been from the detergent chemistry. Oils with higher concentrations of calcium, which is found in many detergent systems, have been shown to increase the frequency of LSPI."
Pennzoil
Pennzoil's Q & A, the topic came up again and they have answered it this way. Remember, SOPUS oils are rather laden with CaSa...
http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3836844/Pennzoil_Answers-Complete_Prot
Q: Could you address operators of GDI-Turbo vehicles regarding the effects of certain additives such as calcium and their impact on LSPI (low speed pre-ignition)? There's much discussion and concern by operators of these vehicles that Pennzoil's additive packages are predisposed to LSPI as compared to other brands.
A: Low speed pre-ignition (LSPI) is more a phenomenon of engine design – and as you mentioned, occurs more frequently in gasoline direct injection (GDI) turbocharged engines. It is really a phenomenon for prototype or experimental engines that are still in the Research & Development phase, and oils with high levels of calcium-based detergents can increase LSPI frequency. HOWEVER, by the time the engine is fully designed and released to the market, it must be compatible with the available motor oils in the marketplace. Thus said, there is no need for concern.