Hello, I am new to nitro cars, I recently purchased a used Duratrax maximum st truck ( Don"t Laugh). it has a torq .12engine, thats all I know. I was told it's about 3yrs old, I'm not sure but it seems to run fine mechanically, I only ran 1 tank of 10% fuel through it. except for some worn out wheel bushings. worn tires, worn clutch bell, and clutch shoes show some wear, my question is , the owner told me he never used after run oil, once in a while he would use wd-40, he said after -run oil was a glorified name for wd-40, but I hear different from everybody else. Do you think this damaged the engine in anyway? second I looked up some prices on tower-hobbies.com (Seems like the only place I can find parts). It's going to cost about $60.00 for the parts I need, Does anybody think it would be a waste to invest in this truck or just buy a new. I didnt realize it needed all this stuff till I started taking it apart and giving it a cleaning it never had before, any comments, tips, or suggestions would be greatly appreciated. Thanks!!