Originally Posted By: ndfergy
Here's an article Molakule wrote on sodium adds a number of years ago:
Alternative Detergents Sodium
In the article he mentions SDDC as a possible AW/EP compound with good friction modification that might appear chemically as sodium in UOA's
Whether this compound is used with MS5K, Valvoline et al is anybody's guess but in the absence of other more popular FM's to help achieve GF-5 targets I'm of the mind that's the case.
Very interesting...thanks to you for posting and to Molakule for writing it!
That's one of the things about working with limited information, I don't know if the sodium I see in some VOAs is from detergents or from other types of oil additives...and, I don't know if it's just sodium-based detergents that can affect LSPI, or other sodium compounds, too. Given that sodium does not appear to be a necessary component in a modern motor oil, I just try to avoid it for now. I guess that if I see that an oil with sodium has passed dexos1 Gen 2 (or GF6, whenever that gets going) with an LSPI test, I feel that I can have some confidence that it's still a good choice for my DIT engine.
Originally Posted By: bigj_16
Originally Posted By: Virtus_Probi
Infineum reported that one of their studies indicated that sodium based detergents were LSPI accelerants in DIT engines when used in combination with calcium based detergents (magnesium based detergents were found to be LSPI neutral).
http://www.infineuminsight.com/insight/nov-2016/quenching-low-speed-pre-ignition
I liked this paper. The problem is that it applies to that engine. You can't necessarily extrapolate that to your engine
Good point, but I'm probably going to be waiting for a long time to see test results in my particular 2.0l Subie DIT engine. I try to make the best decision I can with limited information...I was aware of and considering LSPI in my oil choices before my car was recalled for it, but that's what really got me thinking that I had to take it seriously as a real world problem and not some sort of unrealistic lab creation.