Specifically in the VW/Audi speced 502.00/505.00 requirements. I know the SL, SM and SN oils were higher in some adds that may have been viewed as beneficial to the older engines, such as calcium, zinc, phos etc. I still haven't figured out what, if anything, we gain/lose with move to SP, other than the lower calcium for LSPI prone engines. I know if they meet approvals, then from that standpoint it's moot. Just wondered what it really means moving to SP for older stuff.