Originally Posted By: oil_film_movies
Originally Posted By: kenpoed
Ahh answered my own question. So am I to gather that to reduce lspi the oil essentially has to be a certain clinginess to the engine upon startup?
(Note: I think when SonofJoe mentions "Dexos 2" he really means "dexos1 Gen2". dexos1 is never capitalized. dexos1 is for gasoline engines. Am I right? Seems that way from your text SonofJoe.)
About LSPI, "clinginess" is not relevant to it. You might be referring to the polarity of oil and additives which stick to the surfaces enabling a tribofilm to form.
LSPI technical papers and GM's own dexos1 Gen2 claims indicate it is a complicated detonation issue which can be influenced by some additive combinations in oils, so dexos1 Gen2 oils are usually better at avoiding LSPI in most engines.
Appy polly loggies!. Yes, I did mean dexos 1 Gen 2, not dexos 2 (the diesel spec).
Oh, and while 'dexos' might not be capitalised, BITOG autocorrect always annoyingly puts in the capital D, so it's basically not my fault!
And yes, I've seen the various studies that suggests overbased Calcium detergent contributes to LSPI events and that you're better off with one based on Magnesium. If I'm honest though, I do question why you need a new specification to make this happen. Under the existing Minor Modification rules, you're allowed to interchange a certain amount of Ca for Mg with Level 1 support and more if you have Level 2 support. I also seem to recall you can legitimately add Mg under the TBN Booster rule.