All mcculloch chainsaws that have two stroke engines require a 501 mixture of gasoline and oil the company recommends using universal powered by mcculloch two stroke oil the correct way to mix the fuel is to pour half the amount of gasoline required into a clean container that is approved for fuel by the local authority followed by the entire amount of oil required for the mixture. Type of oil for mcculloch chain saws whether youre choosing an oil to lubricate your mcculloch chain saws engine or to protect its bar and chain its important to select the right one. Fuel oil ratio 401 with mcculloch oil recommended fuel octane regular mix oil specification mcculloch two cycle chain saw mix oil chain pitch 3 8 in chain type mcculloch bar mount pattern shortest guide bar supplied 16 in 40 cm longest guide bar supplied 20 in 50 cm. What is the horsepower of a 610 mcculloch chainsaw i heard the engine dispacement on the 610 its 60 ccs so horse power will be 62 hp wich its pretty good gas oil mixtures mcculloch 610 chain saw