wd-40 will break down the silicone ramp filler in the cranks and also eat the seal on the front bearing. i have tested and seen many things happen to engines and i say and recommend what i do based on actual experiences and not hearsay .
i am not "sponsored" per say by the people/companies that i recommend , i just promote good quality products and if i find a flaw in the product i will see what it takes to fix it unless it lets me down during a race over and over even after i had tried to fix.
rbmods after run oil is the best !!! rick is an awesome guy and is a frickin genius in the nitro rc world !!! his products are second to none and his modificatons , well lets just say they are vvveerrryyy very fast
happy motorin',
monty