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There are two styles or types of oiling to consider here. Some engines have the engine oil separate from the transmission and/or clutch oil. Air cooled BMW Boxer twins are an example. Your engine oil will last a bit longer if it is only lubing the engine. Meshing gears break down the oil quicker than spinning bearings and the clutch adds its own contaminates too. Most Japanese bikes have common engine/trans oil systems. So if your engine oil also lubricates the transmission and clutch... change the oil every 1000 miles. If it just lubes the engine you can go a bit longer. Lots of clean fresh oil will make an engine last a long time. I see very few oil related failures. What I do see a lot of is LACK of oil failures. Check the oil every time you start the engine. No fool'n... every time... without fail... always.
While you are at it oil your rear chain too... EVERY TIME YOU RIDE!!!
Now you ask what type of oil? I have never been a big fan of the motorcycle specific oils. They cost a lot of money and the only tests I've seen show that they don't hold their viscosity any better then regular oils. I've always used automotive oils. The problem now seems to be the new SJ and SL oils. The lighter weights of oil, 10W-30 and lighter, are now formulated to be "Energy Conserving". These energy saving oils have additives that may cause clutch slipping and other problems. They are also short on additives that bike engines need like Phosphorous. These oils will have a "Starburst" on them and will say "Energy Conserving". Right now the heavier oils like 10W-40, 20W-50, 15W-40, and 15W-50 aren't labeled energy conserving and should be all right to use. If your bike needs one of the lighter oils, you could use a light diesel rated oil with a C designation like CG or CH. The diesel oils are not required to be "Energy Conserving". They have come out with a MA and MB designation, but I don't have a lot of info about them right now. Bottom line... A 10W-40 or 20W-50, automotive oil with no "Starburst" symbol, and no "Energy Conserving" label, should be just fine. If you are really worried, get a motorcycle specific oil. However, they do cost a lot more.
I don't have any experience with synthetic oils because...
- None of my customers want to pay that much for oil.
- I don't want to pay that much for my own oil.
- I like frequent oil changes.
As I said before, change your oil often. Now, this always seems to be a big controversy. I don't know why. Seems a no brainer to me. All the tests I've read find that the oil breaks down, loosing viscosity, as the miles pile up. Add in all the byproducts from combustion... acids... moisture... whatever, and you got a mix that is steadily going down hill. Now, your supposed to leave that in your engine for 5-10,000 miles so you can save a few bucks on oil ? No way am I gonna do that. I ride a BMW 750 air cooled twin. When I let the oil go too long the breather valve starts to chirp at me. I put in new oil and it stops. It just got a bit thin. This happens at around 1500 to 2000 miles. I have a Pontiac 6000 car. At around 3-4000 miles one or two of my hydraulic tappets don't want to pump up, so I get a bit of tappet noise. Oil's getting a bit thin. I put new oil in and it goes away. You pick'en up on what I'm saying ? Change your bike's oil at 1000 miles and your car's at 2000 miles. If you are only riding a few hundred miles a year or less, change it at least once a year. Before putting it up for winter, if possible.