Your little Cox has a steel cylinder with an iron piston, and a plain bearing crank. It will wear out in a hurry if you run it on synthetic oil. At least 20% castor is requijred. Using the right oil, it will truly last almost forever. Nitro at 25% is OK, I run that in mine. Your car fuel probably wont do - not enough (if any) castor oil.

The break in is almost immediate, run one or two tanks of fuel at a slightly rich setting and it's ready to go in anything you want.

Bill.