I have a couple of questions regarding motor oil that hope someone could address:
1) I have a Honda mower that the manual specifically states needs either SAE30 or 10W30 meeting API SJ or better standards. The only oil I could find locally was Mobil 1 "advanced synthetic" and, on the back, says something about meeting SL/SM/SN standards. Would this also meet SJ? From what I gather, the later second letter listed already covers anything earlier (for example, since "L" in SL is later than J, the oil would be fine). Please correct me if I'm wrong.2) I noticed a supposedly better Mobil 1 grade in a gold container which on the back says it guarantees 15,000 mi oil changes. I've never heard of this, always changed oil between 3,000-5,000 mi intervals. Is this oil that good?
Thank you.