Mechanics

MAZDA 3 TRANSMISSION PROBLEM

2005 Mazda 3 • 120,000 miles

Overfilled oil tank, drained transmission fluid. What do?

I had decided it may be a good idea to learn how my car works, so I really know what I'm driving, rather than just driving. I decided to go with the first thing anyone could think of: an oil change. I went out, found the proper oil, proper filter, etc. However, after getting all the supplies, instead of locating the drain for the oil, I found the one for the transmission fluid. I drained about 4 quarts of the stuff out (still thinking it was oil) and then proceeded to replace the filter, add new oil, etc. By the time I had realized what I had done, it was too late. The transmission fluid previously in the car had already been disposed of. For a while, I had thought I had overfilled the oil. So, I did what I had researched, and drained about another quart out of what I still thought was the oil. By the time I had realized that the fluid was too red to be oil, it was too late. So, basically my car is dead where it stands until further notice. I've recently located the ATF dipstick (what I presume to be it) and the transmission fill cap. Likewise, I've now located the real oil drain. As of currently, I have a mix of conventional and synthetic oils in my engine. About 8 quarts or so. The Mazda is a 2.0 liter engine, and only requires 4.5 quarts of oil. So, it's double the normal amount. Should the oil be completely drained and the filter replaced? Likewise, how do I go about replacing the transmission fluid? Or, would it just be a better idea to take it to the shop and have them do their thing?

In the words of Gob from Arrested Development: "I've made a huge mistake."
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Guest
January 13, 2013.



Drain all the oil out and change the filter again. Add the necessary oil and thats that.

You never added oil to the trans? Is that correct?

Add 4 qts to the trans and run the motor and re check. If you did add oil to the trans, you need to have the system flushed out and new fluid added.

I dont think you damaged anything. Just learned a good lesson here.

Roy

ASEMaster6371
Jan 13, 2013.
Didn't add oil to the trans, thankfully. The two caps are on opposite sides of the car and properly labeled. Oil was added to the oil. Transmission was just drained a bit, that's all.

Likewise, would I need to drain the rest of the trans fluid and refill it with new fluid so I could get a clean run with that? Or would that be unnecessary work?

Tiny
Jameskrudop
Jan 13, 2013.
Nope, just add the trans fluid and you are good

Roy

ASEMaster6371
Jan 17, 2013.