Correct Oil Fill Quantity - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 02-26-2019, 03:45 PM Thread Starter
 
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Correct Oil Fill Quantity

66 with WS engine. Owners manual says 7 quarts with filter change. Dipstick says 5 qts (can not verify dipstick is the correct one). Pontiac Shop Manual say six qts. Which is correct?
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post #2 of 11 (permalink) Old 02-26-2019, 03:49 PM
 
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As far as I know, most of the pontiacs from the “muscle car” era take 6 qts. My 68 GTO takes 6. I would fill it slowly and keep checking the stick. I don’t know if an oversized oil pan was an option on any of them.
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post #3 of 11 (permalink) Old 02-26-2019, 05:38 PM
 
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AMA Spec sheets show 6 (less Filter refill), so 7 with new full filter.
Your dipstick in not correct.

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post #4 of 11 (permalink) Old 02-26-2019, 08:51 PM
 
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Originally Posted by gnsjoy View Post
66 with WS engine. Owners manual says 7 quarts with filter change. Dipstick says 5 qts (can not verify dipstick is the correct one). Pontiac Shop Manual say six qts. Which is correct?
Interesting. My '68 manual states 5 quarts in the pan Plus 1 quart in the filter for a total of 6 quarts. My 1966 AMA 389 engine spec says 5 quarts -pan, plus filter which is 1 quart for a total of 6 quarts. Chilton states 5 quarts plus 1 for the filter for a total of 6 quarts.

All the V8 Pontiac cars I had used 5 quarts plus 1 in the filter for 6 quarts.

Here is another thread on the same question- https://www.gtoforum.com/f50/oil-type-capacity-20669/
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post #5 of 11 (permalink) Old 02-27-2019, 05:53 AM
 
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Amazing how convoluted all these manuals/books are.

1966 AMA TEMP/LEM 6+
1966 AMA GTO 6+
1966 FACTORY SERVICE 5+
1966 MOTORS 5+

I think its safe to go with the consensus of 6
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post #6 of 11 (permalink) Old 02-27-2019, 05:58 PM
 
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Originally Posted by GTOJUNIOR View Post
Amazing how convoluted all these manuals/books are.

1966 AMA TEMP/LEM 6+
1966 AMA GTO 6+
1966 FACTORY SERVICE 5+
1966 MOTORS 5+

I think its safe to go with the consensus of 6
Interesting.

I do not have the AMA Spec for year 1965, but, my AMA Spec dated 9-2-65 for year 1966 GTO clearly shows 5 quarts plus filter where your states 6 quarts plus filter.

Looking at the 1964 AMA Spec for the Lemans/GTO Option, it also states 5 quarts plus filter.

The 421 Super Duty used a 6 quart pan plus filter.

I have seen this in the specs on the Plymouth Fury. Sometimes they will use the previous year specs on a current engine/car that is still in production. Even options are listed for the new up and coming year and never made available. I suppose that the car specs may have to be submitted at a certain time frame to the AMA and to meet these time frames, they may use some previous engine data to fill in the blanks for the current model engine.

I can also see someone not paying attention when they write the specs and did not notice or understand the fine print "less filter - refill (qt.)"
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post #7 of 11 (permalink) Old 02-27-2019, 06:23 PM
 
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The AMA sheets I've shown above are the 9-2-65 for 1966 pages.

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post #8 of 11 (permalink) Old 02-28-2019, 05:53 PM
 
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The AMA sheets I've shown above are the 9-2-65 for 1966 pages.
Yep, and why I said "interesting, my AMA 9-2-65 for 1966 page shows 5 quarts."
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post #9 of 11 (permalink) Old 03-17-2019, 11:31 AM
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The pan got changed around 1968-69 to a lower capacity. (Has a drain plug on the side instead of at the rear). My '65 389 holds 6 quarts loaded for bear, and my '67 GTO with it's original engine, pan, and dipstick holds 7 quarts. Always has.
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post #10 of 11 (permalink) Old 03-17-2019, 05:15 PM
 
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Originally Posted by geeteeohguy View Post
The pan got changed around 1968-69 to a lower capacity. (Has a drain plug on the side instead of at the rear). My '65 389 holds 6 quarts loaded for bear, and my '67 GTO with it's original engine, pan, and dipstick holds 7 quarts. Always has.
Interesting. The 1967 AMA specs do indeed state 6 quarts plus filter. Looked at the 1968 AMA specs and it goes back to 5 quarts plus filter.

Is the '67 pan unique or are the AMA specs unreliable? My Factory Service Manual for 1968 also states 5 quarts plus filter.
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