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What oil is best for my 610? I use 10/40 in truck but I see on e-bay they want me to use 5/50 ??? any help?
10W40 is the best as it covers the widest variety of heat range.
i usually use 10W40 or 15w50 as it's good from just below 32 degrees to around 115 degrees outside temp. 5W50 is for VERY cold climates.
i also use Kawasaki K-Tech oil which has a Zinc additive in it for the Camshaft. Modern auto oils do not. You could also use regular auto oil with a ZDDP additive.