Hi good people. Maybe you guys can throw a bit of light on this, I have a 1990 ST1100-London which I bought last year. As a matter of peace of mind other than take the last owners word for it I decided to change the oil and filter. I used Motel 10w40 part synthetic oil and a Hi-Flo filter. I'm not a high mileage rider as I would probably do around 3-5000 miles a year. My workshop manual says to do an oil and filter change at 12000km (approx. 7500 miles) but some people I have talked to advise not to leave it more than 4000 miles to change the oil and filter. Your views are grateley appreciated and thanks in advance oPoST1: