Hey there.
I'm using Delo400 and currently changing it out every 4 rides on the trailbike.
Bike is a Yamaha TTR 250. 250 single cylinder air cooled engine that shares the oil with gearbox and clutch. Bike does not have an oil cooler. I think it takes about 1.5 litres of oil or thereabouts.
Trail riding is 30% easy low reving plodding in higher gears and 70% heavy throttle high revs (pinning the throttle and leaving it) in lower gears.
4 rides equates to probably about 20 hours. I'm thinking of getting an hour timer for it as kilometres doesn't really count out on the trail.
Oil is pretty black when it comes out.
What are your thoughts on OCI's for trail bikes?
Cheers,
Dan