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Rotella T4 Usable instead of 10w40 for warmer weather?

120 Views 1 Reply 2 Participants Last post by  SoakedKarma
Been using 10w30 for winter and rotella t4 1 gallon costs about the same as 2 quarts of 10w40. I ask because I dont know how a slightly thicker oil will affect the engine
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I use 10w40 and top up with 20w50 in summer
Than again I don't ride when temps are below 40°F where 10w30 would be an appropriate oil weight
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