Gear oil change interval

Todd Posted 2020-09-07 2:01 PM (#602993) Subject: Gear oil change interval Veteran Posts: 147 Hi folks. Which change interval is advisable for gear oil? My manual says 11,000 miles. Is this requirement still valid nowadays? Shep Posted 2020-09-07 4:25 PM (#602995 - in reply to #602993) Subject: Re: Gear oil change interval Expert Posts: 3400 Location: Chestertown, NY ( near Lake George) What gear, rear diff? Todd Posted 2020-09-08 9:53 AM (#603016 - in reply to #602993) Subject: Re: Gear oil change interval Veteran Posts: 147 Sorry...no, automatic transmission...(atf fluid) Edited by Todd 2020-09-08 9:55 AM Shep Posted 2020-09-08 12:19 PM (#603020 - in reply to #603016) Subject: Re: Gear oil change interval Expert Posts: 3400 Location: Chestertown, NY ( near Lake George) Tough to say, general condition, time all enter the formula. If you are unsure of the history, just do it. Edited by Shep 2020-09-08 12:21 PM Powerflite Posted 2020-09-08 1:33 PM (#603028 - in reply to #602993) Subject: Re: Gear oil change interval Expert 5K+ Posts: 9684 Location: So. Cal If the fluid looks darker red or brownish, change it no matter how long it has been. If it continues to look bright red, like new fluid, you could leave it indefinitely.