api.org states "SP's are bkward compat with SN's". That's not exactly true when it's said "GF-6 = SP" because not all GF6's are bkward compat. You cannot use a 6B where a GF-5 SN was used. Surely the SP does cover over SN SN+, but the not-bkward-compat of 6B is the monkey wrench. In other words, 6B is a SP, but you can't use it where some other SN (non GF-6) was used previously.Some A3/B4 like M1 ESP 5W-30 (3.5+ HTHS) are SN or SN+. So are some HDEO like Delo 400 XSP.
SN does not have an LSPI component. That stated some oils were already formulated with LSPI in mind. M1 claims to have met SN+ requirements since 2010. They also claim their existing formulation met SP GF-6.
GF-6 = SP
GF-5 = SN/SN+
LSPI is only a concern if you have a TGDI. If you have a normally aspirated GDI it's a non-issue.
I forget where, maybe lubrzol site, states the ash and other chemical components (by words, like low this, less that) for 6A's vs 6B's. I thought 6B's had a very different chem composition which was another factor as to why it's not bkward compat, other than 0w16 being the only grade in 6B currently.
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