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Old 08-22-2021, 12:44 PM   #302
RZNT4R
Professional Mechanic
 
Join Date: Apr 2010
Drives: 2017 86 6MT Oceanic
Location: Quebec, Canada
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Quote:
Originally Posted by Blighty View Post
One thing about auto's though - dont stick to the book for changing your automatics transmission oil. Unlike a manual, they a FUCKING EXPENSIVE to fix, and while transmission oil isn't cheap, do not hesitate to get it replaced at half the interval it says for you to to. These older autos will last forever if you just keep replacing the oil fairly regularly.
Quote:
Originally Posted by Yoshoobaroo View Post
This cannot be overstated. I helped a friend troubleshoot a 90s ZF box in a BMW. 200,000 miles on the original fluid. It was dropping shifts and tried to engage REVERSE at the same time as 5th gear. We flushed the fluid and replaced the filter, and then again after a few hundred miles. Ran like a champ after that.
One thing people don't consider is, you can't really empty an automatic transmission of all it's oil without taking it apart and replacing the torque converter or unplugging the oil cooler lines and using massive quantities of new oil to push out the old oil until it runs clean (unless it's a mercedes with a drain plug on the converter, those are cool).

It's not uncommon for the oil pan to hold about half of the oil capacity, so they are quite right: A pan drop & fill at half interval will be the easiest way to keep all of the oil fresh and new enough at all times.
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Blighty (08-22-2021)