10W30 vs 10W40
#4
10W30 vs 10W40
10-W40 is a little thicker than 10-W30. Thats why you run thicker oil in the summer and thinner oil in the winter. The viscosity (basically the buildup of the oil) thins out when it heats up (basically the warmer the oil gets, the thinner it becomes). In the winter, the oil will not get quite as hot as it would in the summer (unless u live in the desert, cali or florida where its always warm), so you can run thinner oil. But if you ride alot and its hot outside (80F or higher) i'd use 10-W40.
#6
10W30 vs 10W40
The base stock, is 10 weight for each oil, then they add viscosity improvers, to get the 30 or 40 weight for hot. The 40 weight has much more improvers than the 30 does. My yamaha owners manual doesnt suggest 10w 40 ever. It does suggest 20w 40 for very hot weather, this is 20 wieght oil with improvers for hitting 40 weight.
The bigger the spread, between the lower number and the higher number, means more improvers. This is why they only recommend 10w 30 or 20 w 40.
Heres some links to more info about oil.
oil links
The bigger the spread, between the lower number and the higher number, means more improvers. This is why they only recommend 10w 30 or 20 w 40.
Heres some links to more info about oil.
oil links
#7
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