Model a oil equivalent to 400w oil gear oil

[reggiedog]

HI;

Can anyone tell me what the equivalent to the 400W oil that the model A venders sell and yes oil goes bad as it gets like very old milk that has curdled, but what I'm looking for is the equivalent to the 400W gear oil that they sell for the Model A's.

As I want to get out of buying from the venders with either the 400W oil or the equivalent to that oil that you can buy in any parts store, as I called my parts store and they couldn't get the 250 gear oil that is mentioned on the 400W bottles.

As they told me to use the 80/90 gear oil instead and that got me thinking would that oil work for the rear end and the steering box, and Transmission of a Late 31 Model A.

As I'm just trying to save myself some money in the shipping of the 400W oil from the venders as I don't want to pay for the shipping on the oil so please let me know as to what to do here.

Reggiedog