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Unread 11-23-2012   #1 (permalink)
deltadart22 is offline Apprentice


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Question 3.8L 5-speed gear oil-What to use?

In the owners manual it says the Manual(transmission) with 3.8L OHV V6 engine it says it takes MERCON ATF(5.6 pints) Right below that it says the Manual with the 4.6L SOHC and Mach 1 V/8 take Synthetic MERCON ATF(8.0 pints)

For me this is a little confusing cause I thought MERCON V ATF was Fords Synthetic ATF. So if i'm reading this right Ford makes a Synthetic and non-synthetic MERCON ATF and these fluids have nothing to do with MERCON V ATF fluid? All I would really like to do is put a synthetic gear oil in my 3.8L gearbox. Appreciate your input. Thanks!
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Unread 11-23-2012   #2 (permalink)
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Those year Mustangs do not take gear oil in the manual trans at all.

The T5 as well as the T45 take ATF.

If you want a synthetic fluid in the trans, you need to find a synthetic ATF with a Mercon V spec/approval.
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Unread 11-23-2012   #3 (permalink)
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It was wrong for me to call it gear oil. It is ATF as you say. But why do they say Mercon ATF and Synthetic Mercon when all along I thought Mercon V was the newer synthetic version of the Mercon ATF? So I would be safe to install Mercon V if it is in fact Fords full synthetic ATF?

I use to drive Mopars and you can't believe how confusing the ATF situation is with them.
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Unread 11-23-2012   #4 (permalink)
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I don't think Mercon is a synthetic fluid. The V part is just the latest update or spec for it.

All you need to do is use a Mercon V spec fluid, it may or may not be synthetic.

Synthetic Mercon V from Ford last time I got some was like $9 a quart. In a black bottle.
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Unread 11-23-2012   #5 (permalink)
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Many thanks for clearing that up. Do appreciate it.
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