So I've been looking for a fully synthetic 10w40 to use in my scooter. It's got a cvt with its own oil so any engine oil should do. What i find tricky is getting a 5 quart jug of any fully synthetic in a 10w40 weight. About the only thing I can find easily is Mobil 1 high mileage. Any opinions about using a high mileage oil in a scooter with 1000 miles on it?