Touring29
If your engine is a 29U 175.4 cubic inches.., the Plymouth Instruction Manual Fifth Edition May 1929 calls for 1 Gal of motor oil.
Do you know your engine serial number. From that we could check the period it was manufactured. It might be that the motor was changed out. If your engine is thermosyphon it is most likely 1929. If it has a water pump and mechanical fuel pump it would most likely be the 196.1
If your engine is a 29U 175.4 cubic inches.., the Plymouth Instruction Manual Fifth Edition May 1929 calls for 1 Gal of motor oil.
Do you know your engine serial number. From that we could check the period it was manufactured. It might be that the motor was changed out. If your engine is thermosyphon it is most likely 1929. If it has a water pump and mechanical fuel pump it would most likely be the 196.1