I'm an older person, private pilot, A&P license, ex late model race car driver an builder of my car. Oil temperature can tell you many things. Oil breaks down at certain temperature, known temps as normal, increasing temps usually mean something going wrong inside the engine.
I would much rather have a direct reading Gage installed where the stupid air temp gage is installed. I've been riding an working on bikes since about 9 yr old. Certified mechanic for Honda an Kawasaki, worked on my HD'S, a lot of aircraft air cooled engines.
I don't mean to be little any one, just want to emphasize that a lot of information can be derived from monitoring the oil temperature of an air cooled engine. Thanks for listening to an old man.
I agree, in the right hands monitoring of oil temperatures can be a good thing. But for the average Joe, it's more of a gimmick than a useful tool. And using a dipstick to do any sort of serious monitoring, versus a real dash mounted gauge, is not what I'd call a serious method.
Face it, the typical Harley rider these days is not a certified mechanic or an oil expert. Having those kinds of people running around all upset over oil temperatures that are in fact not abnormal for a late model Harley, or for modern full synthetic motor oils, isn't doing them any favors. And like I said, if they don't know what really is and isn't a true indicator of a serious problem, the gauge is useless to them and could be detrimental. There is a very good reason why the auto industry largely abandoned truly accurate gauges for things like coolant temp many years ago. Nontechnical people tended to get all upset when the accurate gauges would fluctuate or read a higher number than they thought the temp should be, and when they complained and folks like me tried to explain the range of normal temps and how coolant temperatures will in fact fluctuate depending on ambient temps and driving conditions, they'd call us liars and storm off swearing to never buy our product again. When we then changed those dash gauges to something very akin to an idiot light, where there were no numbers and just a wide green "normal" band and the needle stayed pegged in the center until a truly significant change was detected, those complaints and ticked off customers ceased to be a problem. It's much easier to fudge the gauges than it is to educate folks who don't really know anything about the subject and refuse to listen to anyone who does.
I still run across people who think their Harley should run oil temps in the 180° to 200° range (and think it's a good idea to change the 200° thermostat in their modern car to a 160° version). Folks like that don't need to have gauges in or on their vehicles.
JMHO - Jerry