2006 Pontiac Grand-prix 3.8L, Keep adding transmission oil (4L) everytime I go for test drive, shows low on bottom of dispstick. no apparent leak, where is the oil going?

Asked by Dec 30, 2014 at 05:35 PM about the 2006 Pontiac Grand Prix Base

Question type: Maintenance & Repair

Am backyard mechanic.

3 Answers

To clarify, Car sat for a few months, customer brought car because transmission slipping. Tranny oil was low on dipstick. Added 4L so far. everytime taking it for a test drive, it drives good (no slipping), but upon return, dipstick showing low.. no apparent leaks. Don't know where it could be going??? Repaired Tranny cooling line for a leak. I realize that max fluid is 7L. My train of thought is that if I added 4L already, I would have thought the transmission would have slipped more then just a minor slip which it was doing?? Just don't want to miss anything and looking for knowledge... thank you for your help

5,435

If it was down that much originally you'd figure the torque converter wouldn't have had enough fluid in it to move at all. Seems like the only thing to do is to add fluid and keep checking for leaks.

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4,185

It actually holds 16L so if you've only added 4L you've got a ways to go. True its unlikely it was bone dry, the torque converter for example would still have been full, but still it could be down more than 4L. A lot of automatics sill still operate even though they are 5 or 6 liters low. They just don't operate efficiently or stay cool for as long. You're adding it with the engine running, right? If not it will show full until you run it for a bit and then it will show as being low again.

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