Does anyone have a favorite oil? And if so, why do you think it's good? I'm using Quaker State Ultimate Durability 10w-30 full synthetic. I chose this oil because it's full synthetic and it has a high pressure rating of over 100,000 psi.
I'll caution you about possibly using the thinner grades of automotive oils, these days. (Energy Conserving/Resource Conserving in the roundel on the back label.)
They tend to have too much of the super slippery additives which can cause not only drive clutch slippage in wet clutch motorcycle engines, but also starter clutch slippage.
The slippery additive impregnation adds up over time, so it doesn't necessarily happen immediately. But un-contaminated KLR clutches have been know to operate over 200,000 miles.
Best to use oils with the JASO MA / MA2 or MA3 rating on the back label to ensure that it is wet clutch compatible.
Most of them are 10W40 graded or higher, but there are exceptions. Kawasaki sells a 5W40 Semi-Syn with JASO MA2 grading.
The thinner grades are also intended for continuous use in ambient air temps under 40F, not 60 - 100F which is normal motorcyclist riding temps.
Here is the oil analysis thread, https://www.klrforum.com/klr-other-m...is-thread.html