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May 26th, 2015, 02:42 PM
#3
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Join Date: May 2015
Location: Marietta, Ga
Posts: 10
1966 Cutlass 330ci 4bbl
Just bought a '66 330 4 bbl and want to do an oil change. Does anyone know the oil capacity for this engine? Also, I have noticed a few drops of oil under her and wanted to get some feedback on main seal stop leak products. ie- Blue Devil or Barrs. Thanks in advance for any help y'all can give.
May 26th, 2015, 04:55 PM
#6
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Join Date: May 2015
Location: Marietta, Ga
Posts: 10
Let's try this
Well, my dad and brother are Chevy men (Corvettes and Camaros) but I've always had an eye for the old Oldsmobiles. I've been looking a long time and wanted to get the best that I could afford. I started out looking at 70 or 71 442's but, quickly realized that a nice one was out of my ballpark. So when I saw this older restoration 66 Cutlass Convertible 4 speed, I jumped on it. She has a #'s matching drive train and is believed to have 85k original miles. (No docs on that) I am very excited and look forward to getting the family in it and enjoying many sunny afternoon cruises. I also look forward to picking y'alls brains about all things Oldsmobile in the future.
May 26th, 2015, 09:22 PM
#12
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Join Date: Aug 2011
Posts: 2,999
There are two types of drain plugs in that era. I am not sure which a 1966 has; but, if it is not a regular hex head it is the early style. Although there is a special tool for the early plugs, a 1/2" ratchet or breaker bar with nothing attached to them works well. Place the square drive of the breaker bar or the ratchet into the plug and break it loose. The early plugs drained A LOT of oil fast so be ready.
May 27th, 2015, 07:53 AM
#13
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,311
Welcome. Very nice looking car, you've done well. Be aware, however, that Oldsmobile didn't start stamping the VIN derivative on the block and trans case until the 1968 model year, so there are no numbers that "match" on your 66. If you have the Protect-O-Plate, it will link the engine and trans unit numbers to the VIN, however. Good luck with the car.
May 27th, 2015, 08:13 AM
#14
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,311
I merged your two identical threads. Typically you will get a better answer if you keep all responses in a single thread. This way incorrect information can be caught and corrected more quickly. And to answer your original question, every RWD Olds V8 engine from 1964-1990 with a stock pan takes five quarts of oil with the filter. Yes, I am aware that the 307s claim to take slightly less, due to the miniature oil filter used on those cars. I put in five anyway (as the extra leaks out or burns off quickly. 
)
)
May 27th, 2015, 02:07 PM
#17
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Join Date: Jun 2009
Location: southeastern Michigan
Posts: 14,168
Strangely enough, no. No one knows, and after almost 50 years now, no one has ever been able to figure it out. Sort of like Bigfoot or the Loch Ness Monster. A mystery that will probably never be solved.
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