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post #1 of 11 (permalink) Old 12-11-2016, 10:50 AM Thread Starter
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Compatible Manual Transmission Fluids?

I tried searching the forums but did not find an answer. I have a 2009 Chevy Cobalt base model with manual transmission that I recently bought that has more than 140,000 miles on it, and I'm aware that these aren't supposed to have transmission fluid changes but with that kind of mileage I believe it's about due. I'm trying to find out what type of transmission fluids are compatible with these transmissions? I believe I recall my owners manual showing 75W85 gear oil, The closest I've been able to find at auto parts stores is 75W90. Would that be as good to use, or is it a bad idea?
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post #2 of 11 (permalink) Old 12-11-2016, 11:43 AM
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For your 09 ls or lt or base Manual transmission use Dextron ATF fluid!!!
Do NOT use gear oil
Your owners manual lists
Manual Transmission Fluid (GM Part No. U.S. 88861800, in Canada 88861801).

From GM Powertrain, Your Getrag F23 (M86) 5 speed manual transmission uses DEXRON VI ATF
Take a look at the following. It references a 2010, yet is the same for your 09.
http://www.gmpowertrain.com/powertra..._f23_m86_n.doc

Last edited by 1966tbird; 12-11-2016 at 11:55 AM.
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post #3 of 11 (permalink) Old 12-11-2016, 12:11 PM Thread Starter
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Okay thanks, I believe I recall the owners manual in my car says 75W85 gear oil. Maybe it is from a different car? Which transmission is supposed to have the gear oil?
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post #4 of 11 (permalink) Old 12-11-2016, 12:30 PM
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The SS uses a different transmission and calles for the gear oil
Now you can find Dexron III and Mercon or Dexron/Mercon at any auto parts store.
You will find your tranny fluid call out on page 6-12 of your owners manual and can download a copy from Gm.
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post #5 of 11 (permalink) Old 12-11-2016, 12:34 PM Thread Starter
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Okay thanks, so then any current spec automatic transmission fluid, such as mobile 1 for example should be okay?
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post #6 of 11 (permalink) Old 12-11-2016, 12:43 PM
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As long as it says dextron mercon your safe
There is some gm wish wash about not using dextron 6 vs dextron 3 because gm no longer licences the name. The fluid will still be around for ages because many other car mfg use that fluid (Ford) and the oil companies still sell oil for older cars.
Remember GM is in the business of selling NEW cars.....not trying to help you keep your old dino on the road any longer than,past the warrenty.
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post #7 of 11 (permalink) Old 12-11-2016, 12:46 PM Thread Starter
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Okay thanks that helps a lot. It is really frustrating how complicated they make a simple thing like figuring out what transmission fluid to use.
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post #8 of 11 (permalink) Old 12-11-2016, 12:48 PM
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Did you find the how to drain & fill post?
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post #9 of 11 (permalink) Old 12-11-2016, 12:50 PM Thread Starter
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It looks really easy, but I'm going to have a mechanic do it just because. I'll probably have him change the oil at the same time.
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post #10 of 11 (permalink) Old 12-11-2016, 12:55 PM
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Cool.
Just remember to let him know Do Not Use that 90W gear oil. It way too thick and the 85W is almost as thick and will trash your tranny in short order
Take a look at
https://www.yourcobalt.com/forums/mai...ion-fluid.html
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