start with 5-7-3 or 5-7-2... buggies use thinner oils most of the time... my Mugen truggy i run 25-15-3 and Mugen buggy i use 7-7-3 everywhere... with my second buggy (Losi) that i am trying out im running 5-5-3 or 5-7-3 or 5-5-2 depending on track. and on losi truggy i had i ran 5-10-2 if i remember right.