02-17-2020, 01:52 PM
I had been using 15w-50 range for my CB sometime now. My watercooled Kawa had been using 15w-50 for 100k KMs, (touch wood) and she is still running strong... Just slightly heavy but running in the heat can hear the engine sound different when using 10w-40 and 15w-50. I rode my bike in the temperature range of about 80 -102 fahrenheit long hours, and 10w-40 will evaporate slightly. But if the bike only see short ride, i would still recommend to use lighter (30 / 40) weight oil.