Working my way through the recently-released revision of the MML, I notice that footnote 4 regarding oil filter changes remains unchanged: a 50-hour interval applies if leaded fuel is used more than 30% of the time (05-20-00, page 10). By contrast, footnote 5 regarding oil change has actually changed from the wording identical to past and present footnote 4 (that is, it applies if leaded fuel is used more than 30% of the time) to eliminating the 30%; it seems to imply that if AVGAS is used AT ALL, the oil should be changed every 50 hours (05-20-00, page 12). I've never used AVGAS in mine to date but still change at 50 hours, so it's fairly moot for me but I'm wondering about any insights re the change.
Of note is, unlike other changes, there's no "bar" next to that item, calling out the change.
Any insights on this?
/Ed
