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Old 08-07-2009, 12:15 PM   #1
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Trans Fluid...Can you mix...

regular ATF-3 with synthetic ATF-4....?

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Old 08-07-2009, 01:49 PM   #2
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Just asking but why you want to do that? I am guessing there would be a problem?

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Old 08-07-2009, 02:23 PM   #3
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I wouldn't mix them.
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Old 08-07-2009, 02:24 PM   #4
that's what she said

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i don't think it would be wise to mix them.
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Old 08-07-2009, 03:46 PM   #5
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If your tranny is old enough that it uses ATF+3, you can add ATF+4 to the ATF+3 without problem as ATF+4 is fully backwards compatible with ATF+3. I would not go the other way however, like adding ATF+3 to a transmission that is supposed to run ATF+4.
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Old 08-08-2009, 06:58 AM   #6
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I dropped the pan to change the filter. I know that dropping the pan does not drain ALL the fluid. So I was wondering if I should refill with synthetic since it would mix with the non synthetic. I ended up just putting the regular stuff back in.
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Old 08-08-2009, 10:29 AM   #7
Knows a couple things...

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Yes you can mix synthetics and mineral-based lubes.

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