Here's a question about mileage vs time. IF you ride a least once a week and put a couple hundred miles on the odometer, why do you have to change the oil every year? I understand if it sits for weeks on end.
It depends on the oil. The advice to change every year is a One Size Fits All recommendation. But the fact is, it all depends on the oil you are using. I've told this story before. But here it is again.
I put about 3,500 miles on my 2008 GS and then let it set for over 4 years. I was amazed at how much time had passed when I went to register it again. I had to replace the battery, etc., to get it running again.
I wondered about the oil, having sat there for so long in our high, east Tennessee, humidity. But I decided to just run with what I had. I put another 1,000-1,500 miles on the oil and sent a sample to Blackstone Laboratories for analysis. (I highly recommend Blackstone. Any lab will give you accurate numbers. But Blackstone goes above and beyond with personal diagnosis and recommendations. They are also very happy to speak with you if you want more detail)
I fully expected to see elevated iron, aluminum, and other elements over my previous results. (I get the oil tested every time from the start with BRP's blended oil, then switched to Amsoil on the 3rd oil change. I wanted a baseline with the OEM oil for comparison)
The Amsoil came back with flying colors in all categories. Nearly identical to all the previous tests. Sitting this long with the contaminants which build up in any engine oil with use should have shown additional wear evidence. Because sitting that long, the oil drains off the parts exposing them to moisture and rust. When you run the engine, those fine rust particles show up in the analysis. Aluminum and other parts can suffer the same due to damage created by the combustion contaminantes creating a corrosive brew.
Most lubricants, after having been run, then allowed to sit, degrade and lose their ability to properly protect an engine. Hence the recommendation to change once a year. Amsoil claims to stay on all engine parts giving them protection that most other lubricants do not. I, inadvertently, had a chance to prove them right. This is why I recommend to my customers that they change Amsoil at the mileage limit. Regardless of how long it takes them to get there. Why throw away good oil? This is also an aspect which tends to make Amsoil less expensive in the long run than less expensive lubricants.
Most people have loyalty to their oil like they do to their sports team. I understand that. I used to be a Padres fan! But my loyalty to Amsoil is 100% performance based.
If you decide to get your oil analyzed, I'd love for you to send me the results. I've had many customers over the years do exactly this. I even had 1 customer that had his oil tested every 1,000 miles between changes. He worked for a construction company and got the tests done for free. He rode a lot and brought me the results from several different brands over the years. It was very interesting to see how much the different lubricants varied in how they held up.
Have a Great Riding Season!