Join Date: Apr 2004
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Re: What kind of oil to use in Honda TRX 400
Depending on where you are running (summer for most of us), I would put a full synthetic 10W-40 or 15W-40 oil in it. This will keep the oil flowing real well and protect the internals also. Castrol and Shell (Rotela T) are excellent choices. 92 octane should do well with the 11.1 high-comp piston. I would spend the extra money on the "race" fuel or octane boosters. As long as it is not pinging, you could even go a few points lower (providing the gas in your area is of good qaulity). Hope this should help.