Re: what type/brand of oil do you use?
That is correct, a UOA provides a starting point. Some engines are murder on oil. VW's 1.8t is one, it will destroy a top quality synthetic in 4-5k miles. Nissans VQ35de is another, it will use up a good dino oil in 3000 miles. So until you know what your specific engine is doing to the oil, picking a OCI is kind of a guessing game. Too early and it is wasted money, too late and you can be damaging you engine. I do a UOA on every vehicle I own once a year, just to be sure that my plan does not need adjustment. As engines wear, your service intervals change. Motorcycle engines are tough on oil due to the shearing forces of the gear box. Most manufacturer recomended intervals and oils will be ok, but at least in my bikes, just barely.
I was speaking of the oil selection only, but since you are bringing up the whole change process...
And they are basing these intervals on what, science? I don't think so. If you are going to be scientific about it, you will have to do it like they do oil changes on large truck/bus fleets. Pick an oil that has a know track record. Run the oil for X number of miles send a sample off for analysis, and adjust the change interval accordingly.
That is correct, a UOA provides a starting point. Some engines are murder on oil. VW's 1.8t is one, it will destroy a top quality synthetic in 4-5k miles. Nissans VQ35de is another, it will use up a good dino oil in 3000 miles. So until you know what your specific engine is doing to the oil, picking a OCI is kind of a guessing game. Too early and it is wasted money, too late and you can be damaging you engine. I do a UOA on every vehicle I own once a year, just to be sure that my plan does not need adjustment. As engines wear, your service intervals change. Motorcycle engines are tough on oil due to the shearing forces of the gear box. Most manufacturer recomended intervals and oils will be ok, but at least in my bikes, just barely.