Is castrol actevo x-tra4t 10w40 a good oil to use in 1986 Honda 350 fourtrax?
Yes, Castrol Actevo X-tra 4T 10W40 is a good choice for your 1986 Honda 350 Fourtrax. The 10W40 viscosity grade is recommended for use in most climates, and the oil is formulated with a blend of high-quality base oils and additives that will provide excellent protection for your engine.