I would continue to change my oil the same way I always have: once a year whether I need to or not.
I was told the service interval for a Roadliner oil change is 4,000 miles or twice a year. I would not go 4,000 miles in 6 months.
And I would not extend the interval whether I used synthetic or not.
But I keep seeing stuff like this
On the subject of whether or not to use a petroleum or synthetic motorcycle oil my recommendation is to use a premium quality synthetic. There is absolutely no comparison between the two. Synthetic oil has been proven to resist high temperature breakdown and shearing effects at higher engine operating temperatures for a much longer time period than petroleum oil and as a result allows the oil to stay in the specified viscosity grade much longer. Synthetic oil is more uniform in molecular structure and will reduce internal friction and thus provide for lower engine operating temperatures as well as provide for smoother shifting.
We have measured the cylinder and cylinder head operating temperatures in two identical motorcycles; one running petroleum oil and the other a premium quality synthetic. We measured an average of 15-20 degree F. temperature difference after a very mild ride and short period of idling. At extreme engine operating temperatures and conditions this value can be up to 35-45 degrees F. lower with synthetic oil. We have received reports of this from motorcyclists that have oil temperature gages installed in their crankcase. We received another report of a customer that when he was using petroleum oil in hot summer heat and traffic jams he would have to shut off his air-cooled V-twin engine because it began overheating. After changing to a premium quality synthetic motorcycle oil his engine temperatures dropped significantly and he no longer had that problem on hot summer days in traffic. Again there is no comparison between the two and anybody that tells you otherwise has obviously not reviewed documented test data and facts clearly showing that synthetic oil outperforms petroleum oil in every category.
We have a report of a dynamometer test run comparing a specific manufacturers branded motorcycle oil to a premium quality synthetic oil. In the first part of the test with the petroleum oil installed in the engine, transmission and primary chaincase the maximum horsepower (Hp) was 68.1 and the maximum torque was 80 lb.-ft. In the second part of the test the same motorcycle was used and all petroleum oil products drained from the engine, transmission and primary chaincase. With the synthetic the maximum Hp was 69.8 and the maximum torque was 81.3 lb.-ft. Thatís a gain of 1.7 Hp and 1.3 lb.-ft. torque, which is what We consider a significant amount of gain just from changing from petroleum oil to a premium quality synthetic oil.
It is hard to separate the truth from the industry telling you what they want you to think.
As for the "hundred thousand miles" thing, that of course sounds really good to me.
I just came across something last night that had me a little concerned: 3rd gear failure on Roadliners
Fortunately, it doesn't appear to be as widespread as the few people complaining about it try to make it seem. And my bike makes no "noises" so far in any gear. Other than her standard purr.
Oh, and Sparky, my bike already HAS an oil cooler. I thought it was just a stock feature on the Roadliner. Am I wrong? My unit sure looks OEM.
On my view, the cooler the better. When I first started looking at bikes, I only considered water cooled bikes. I stumbled across this Roadliner the last week of my search, and asked a lot of questions before concluding I would probably be all right even out here (not a lot of traffic jams in this area).