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All oil companies recommend that the oil be changed in the vehicles service interval or one year which ever comes first. HD also says 5K or one year.
On the bikes that don't get 5K in one year I do go 2 as they are stored in climate controlled garage. It seems okay so far.
The oils additive evaporate or deteriorate over time. Oil in a unbroken sealed container are given a 5 year shelf life.
Air cooled motors are more severe duty that water cooled motors. The oil is more critical. But I'm with the side that says it can go longer.
I did just start using Rotella T6 for diesel engines. It is rated for wet clutches and many Shell employees have used it in their bikes for years now. I did the 5K service on the Vrod and the 30K on the UC last month. They are in storage until spring. I started the UC and went around the block to check for leaks. When I parked it in the garage I left it running. Put my ear close to the heads and listened. The top end was as quiet as I've ever heard it. Very quiet in the primary area also. But at 73 I maybe deaf.
i dont have any empirical evidence, but it just seems a bit off to me to send my used oil test to a competing oil supplier......
good suggestion to the op, but i would use blackstone labs myself.
Someone needs to send them a sample, along with samples to other labs. Two other labs. Lie about what oil it is and see what they say. Send a well used sample of amsoil to amsoil and tell them it is Castrol GTX high mileage car oil. Tell blackstone its 15W40 diesel oil. See how honest they are if they tell you that you are full of **** or not.
I think you will get a canned response at best from any of them. Would be a cool integrity check.
I took mine out for a nice long ride before I garaged it for winter. That gets rid of the moisture -- and since the oil was relatively fresh, I won't change it until well into the spring.
Oil changes are cheap insurance. You buy a $20k (or more) bike then worry about a $25 oil change. Change it. The bonus is garage time getting quality time with your bike.
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Just mention you need advice on oil...and all kinds of stuff comes up. Why is that? The instructions in the Owners Manual are pretty straightforward aren't they? Maybe mix in a little common sense for good measure and you're good to go. But send oil samples to a lab? Really?
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