04-03-2014, 02:57 AM
I have read that you should avoid using oils that are blended for higher gas mileage. I used to be an oil fanatic, using the very best oils and changing at very short intervals. As I got older, I started using good API rated motor oils like Pennzoil or Rotella and have never had a problem with many different bikes. I typically change about every 3000 miles. I have read suggestions to use oils blended for motorcycles, as they have additives for the transmission gears but I have never had a transmission or clutch problem when using car oil. For very high revving bikes, I do use oils blended for high performance engines. On another point, I have read that viscosity modifiers are rarely effective for more than about 20 points over time, so 10W30 probably is effective but 10W50 or 15W60 is probably a waste of money.