It's common for manufacturers to recommend thicker oil for higher ambient temperature. But if the coolant temperature gauge says the bike isn't running hotter, why different oil? Does the engine have hotter operating conditions in some way not indicated by coolant temperature? Or in the case of my air/oil cooled BMW temperature of whatever the dash indicator is measuring.
I wonder because temps have been high here lately (38+ C, 100+ F). And for the CRF1000L I just changed the oil on, the only recommended grade is 10W30. Yet on the africa twin forums some owner report that their local dealers use or recommend 40 instead of 30. In one case due to the tropical conditions there.
I continued to put 10W30 in it. But I wonder if I'm making a mistake. I still haven't completely wrapped my mind around 10W30 being sufficient to lubricate a gearbox. DCT in this case.
I wonder because temps have been high here lately (38+ C, 100+ F). And for the CRF1000L I just changed the oil on, the only recommended grade is 10W30. Yet on the africa twin forums some owner report that their local dealers use or recommend 40 instead of 30. In one case due to the tropical conditions there.
I continued to put 10W30 in it. But I wonder if I'm making a mistake. I still haven't completely wrapped my mind around 10W30 being sufficient to lubricate a gearbox. DCT in this case.