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Old 09-10-2012, 08:30 PM   #1
kochic
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Bronco Info: 1979 bronco,351m C6 np 205,
What type of oil in a 1978 c6?

Hi,
Do i need a type F oil or dexronIII in a C6??
I used the search fonction, i almost always find the answers i need but not this time...
An old guy at work told me that it need type F, Ford=type F.
The Napa store dosent have any pint of type F in stock.
I must be surely for car older than my bronco (1978).
Thanks,

Marc
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Old 09-10-2012, 08:35 PM   #2
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I would agree with the type F, its what is in my '78.
I got it from a farm supply store
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Old 09-10-2012, 08:42 PM   #3
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Yes type F, try a different store you shouldn't had any problems finding this fluid.

And it's Fluid not oil if you ask for it.
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Old 09-10-2012, 09:09 PM   #4
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Bronco Info: 1979 bronco,351m C6 np 205,
Thanks guys,
I will try another parts store,
Sorry for the wrong word, english is not my first language.

Marc
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Old 09-11-2012, 03:57 AM   #5
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makes me glad i put FA. i just guessed
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Old 09-11-2012, 05:44 AM   #6
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Unless the trans has been rebuilt; usually a rebuilt will use modern internals (friction material) and then require Dextron or something equal.
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Old 11-10-2012, 08:49 PM   #7
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Bronco Info: 1979 bronco,351m C6 np 205,
I completly forgot to check on the dipstick,
I need cj fluid, after some reading i can replace it with dextron-mercon II
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Old 11-11-2012, 12:24 AM   #8
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Stick with Type F. Ford still produces it, and Ford doesn't recommend Mercon for transmissions built for F.
Quote:
Originally Posted by Ford
Motorcraft® MERCON® V
...
Do not use in applications where MERCON® SP, MERCON® LV, Continuously Variable Chain Type Transmission Fluid, Motorcraft® Premium Automatic Transmission Fluid, FNR5 Automatic Transmission Fluid or Type F Automatic Transmission Fluid is recommended
This is incomplete, but it seems to suggest that C6s used F until '81.

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