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how much fluid does the tranny hold on an 02 auto, Im just draining and refilling. and how much oil does the engine hold (non v-tec)

 
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ATF=3qts / Oil=3.5qts

 
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those are all rough estimates from the service book tho. oil takes anywhere from 3-3.5 qts and its best to check the level as you are filling to avoid going above max. check it again after driving cause you may lose a bit in the new filter. trans is pretty consistent around 2.9-3.0 qts. the whole trans holds about 9 qts but only 3 will drain out.

 
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Would a tranny flush be better and where should i go to get a flush?

 
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^ No, just a drain and refill.

And only OEM fluid.

 
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tranny flush is a very bad idea