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Birdman,
Until oil gets upto about 185 degrees F it tends not to flow well. It doesn't flow ito all the nooks and cranies in the bearing surfaces and will not be able to hold a load well. Many oils are designed to work best around 220 degrees F - this includes 5w-X and 0w-X oils.

The cam and tappet surfaces are extremely vulnerable to low temperature wear due to being oiled much later in the oiling system.

Also, the block temperature (engine water temp) changes the distortion in the cylinders by a fairly large amount when you compare temps at 50* F and 190* F.

I have a car where the ECU prevents the engine from revving very high until the engine gets above 165 degrees. This is for a good reason.

15 miles seems like a good idea, but you should go by the temp indicator on the bike. 4 bars is a good place, but in cooler outside temps, the oil will remain cool for quite a while. When it is really cold, you may evn want to put a cover over the oil cooler.

Use common sense and get as much information as possible.

I hope this helps.
 

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Your bike has a real gauge. the later ones have bars - not nearly as good for engine temp.

The oil stays fairly warm for a while. If you feel theoil cooler (carefully), you can get an idea of how warm the oil is, or isn't. But I like to take the outside temps into consideration and use engine temp to gauge when I can get on it hard.
 
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