Originally Posted By: RonH
Honda recommends 10w30. Would 15w40 be a suitable oil for a Goldwing? I worry about riding in 110 degrees with 10w30 but if that's what Honda recommends, should we still be leary?
Originally Posted By: RWEST
The engine hasn't changed (that I know of, anyway) since a 10-40 was spec'ed, and lots of guys run 5-40, 15-40, 15-50, etc.. in their 'Wings.
+1 to RWEST. I'm in Tucson and I run Rotella 15W-40 year round in my 2007 Wing. I've got UOAs on this site to show it works well.
The Honda owners manual allows for a 40-weight at higher temperatures. Their chart is really ambiguous about the temperature point where a switch to 40 is suggested. By my eye ... 80 degrees? So it's not like they're saying "30 and only 30" ... it's "30 and perhaps 40."