very much the old method above and pretty brutal if you think about it when you preheat to 200-230f the motor will turn freely and put much less stress on the rod as its not smashing the piston into the taper increasing its lifespan checkout the engine break In bible on rctech and spend £40 on a preheater and a temp gun your engines will last much longer and 3in1 can be used as after run oil
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