90 weight oil. Gary Hearn on Nov 1, 2009Try NAPA. Rick on Nov 1, 2009Went looking for some for my Plymouth. plym_46 on Nov 1, 2009oil. m16 on Nov 2, 2009Re: gear oil. Ray on Nov 1, 200990 Wt. Transtar60 on Nov 1, 2009M16 gear oil. Roger List on Nov 1, 2009Some notes on gear oil. Gary Ash on Nov 2, 2009Gear oil source. Rick on Nov 2, 2009pennrite. m16 on Nov 3, 2009