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.