imported post
I've been using DELO 400 15W40 in all the four stroke machinesI have for years and never have had a smoking problem caused by oil. My 1500 doesn't smoke unless it's been sitting on it's side stand for a couple days which is a common place happenstance with boxer type engines. All Goldwings will do that now and then. I've tried synthetics a couple times over the years and never saw much effect except for my wallet thinning out faster. My 1500 has 128,000 miles and hasn't suffered from petroleum based oil use. The key thing about lubricating oil no matter what type you use is regular oil changes so the old oil that's been contaminated by combustion byproducts doesn't sit in the crankcase for long times eating at the bearing surfaces. Synthetics can't prevent that. If you're putting on a lot of mileage in a short time then it's safe to stretch out the oil change interval. I don't change oil on a long road trip, I wait until the long riding is over. It's a bike that's used only intermittantly that suffers with old oil. Also if a bike is going to be stored it should have fresh oil.