Making oil.....is caused by carbon build up caused from doing a lot of idleing or slow running.....thats why they say to run the snot out of it everyonce in awhile. What happens is carbon builds up around the piston rings and the rings stick and let some gas bypass into the crank case or oil sump.....it gives you a higher reading on the dip stick. If you follow the manufacturers instructions and mix Ring Free at one ounce per ten gallons of gas you will never have this problem. Ring Free is made by Yamaha ......you can get it at any Yamaha dealer and most auto parts stores also have it.