Dodge51coronet Posted November 7, 2015 Share Posted November 7, 2015 According to the shop manual, my '51 Dodge Coronet's Gyromatic transmission calls for 3 qts. of 10W motor oil, and if that weight oil cannot be located, 20W is "acceptable." I am the third owner of the car and I am quite certain that the tranny has never been serviced in the past 65 years. The seals are all starting to leak. I am planning to drain and reseal everything, however I am having a difficult time finding 10W oil in smaller quantities. So far all I have been able to come up with is a 5 gl. container for $68.00 from a tractor supply store. Napa carries 30W non-detergent motor oil for $3.99 per qt. It specifies on the label that it is designed for early model cars. Due to the fact that I will be driving the car in the extreme Florida heat, I was thinking that non-detergent 30W might be a better option for me to use anyway. I was hoping to get some feedback from other fellow flat head six, gyromatic owners. Thanks for any advice you can offer! Link to comment Share on other sites More sharing options...
RickBrinker Posted November 7, 2015 Share Posted November 7, 2015 USE 10wt NON DETERGENT Only !!!!!!!!!!! Link to comment Share on other sites More sharing options...
ol swede Posted November 8, 2015 Share Posted November 8, 2015 Available at O'reillys. My local store anyhow. Good hunting. Link to comment Share on other sites More sharing options...
Dodge51coronet Posted November 8, 2015 Author Share Posted November 8, 2015 Yeah I checked O'Reilly's, as well as all the other auto stores in my area but to no avail. I was able to find a tractor supply store that carried a 2 gl. container of non-detergent 10W for $28.00. The only problem was that I had to drive 29 miles to get there! At least now I will be able to use the correct specified oil for the transmission. Well anyway, that quantity oughta hold me for a while. Link to comment Share on other sites More sharing options...
Guest Bob Call Posted November 8, 2015 Share Posted November 8, 2015 Chrysler used SAE 10W for everything. Your transmission probably holds 3 pints not quarts. The fluid coupling holds several quarts. Buy the 2 gallon container. Or, you may use TDH ISO 32 fluid which you can get a Tractor Supply Company. It is very nearly the same viscosity as SAE 10W. If you don't have a shop manual for your Dodge, get one. Chrysler used SAE 10W for transmissions, power steering, fluid couplers, engine oil and torque converters. Link to comment Share on other sites More sharing options...
Spinneyhill Posted November 8, 2015 Share Posted November 8, 2015 I got my ISO 32 from a shop that deals in machinery. It was also available from an oil brand outlet (oil only). Here is a nice viscosity comparison chart. http://www.bobistheoilguy.com/viscosity-charts/ Link to comment Share on other sites More sharing options...
StillOutThere Posted November 13, 2015 Share Posted November 13, 2015 Yeah I checked O'Reilly's, as well as all the other auto stores in my area but to no avail. I was able to find a tractor supply store that carried a 2 gl. container of non-detergent 10W for $28.00. The only problem was that I had to drive 29 miles to get there! At least now I will be able to use the correct specified oil for the transmission. Well anyway, that quantity oughta hold me for a while.If one O'Reilly had it as commented above, then any other O'Reilly can certainly order it in. Link to comment Share on other sites More sharing options...
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