Way over kill for me.... from 1980 to approx 2005 I changed mine every July then in Oct when I put it away. Since I averaged 1,000 miles a season give or take there were many times I saved the oil and ran in one of oil burners (or changed it) since it was so clean. Since I started running it all season and still ave about the same. And those were the days of reg Castrol and Valvoline too so couldn't of afforded synthetic doing that.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....