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I Have Done Service Work All My Life, If You Want It To Last Change The Oil. It Will Go Bad If You Work Your Truck, Bad Oil And Towing In Over DRIVE Is What Will Take Your Trans Out, If You Are Very Nice To Your Truck The Oil Will Go A Long Time, But If You Tow With It And It Gets Hot It Will Burn The Oil Or Shorten The Life Of The Oil And The Trans. I Have A 07 2.7 And A Big Oil Cooler And If I Tow A Good Load With The Little Truck I Do A DRAIN And Refill With The Iv Toyota Atf, I Have Had No Problems, There Nothing You Can Do That Your Truck Will Like Better Than New Oil, I Do Not Have All Of The Certifications That Some Have But Have Been To The School Of Hard Knocks And Been In Service All My Life. Yes It Cost To Be A Oil Chang Nut. I Have Never Had A Eng Or Trans Go Bad Because Of Oil Please Change Your Trans Oil. Toyota want to sell cars and trucks not make them last a long time.