2005, built and spec'd in 4/2005 for 5W-20 SL. Presumably, I'll be running SM-rated oil. So what's my additive to restore the difference between SL and SM as I go along? Or was SL spec'd simply because SM wasn't out yet, and it makes no difference?
Was there an additive pack in SL that the manufacturer built for that isn't part of the SM makeup?
Was there an additive pack in SL that the manufacturer built for that isn't part of the SM makeup?