I have a 235 engine in my truck. I added an external oil filter. Both the Shop Manual and the Owner's Manual say to add an additional quart of oil if using an external oil filter.
The restoration shop says they put in 6 quarts of oil due to it having the external oil filter. Oil level did not measure up to the 'ADD' mark on the dipstick that was in the engine when I bought it many years ago. Never drove it until recently when the restoration was complete, so do not know if the dipstick is original to the motor.
After pointing out to the shop that the oil level appeared to be reading low, I added an additional quart. The level rose to about half way between 'ADD' and 'Full'.
Unless there is more to the mystery someone can share, my question is, 'Is there a different dipstick that is required for engines having an external oil filter'? That would make sense, but I have not found an after market supplier of a dipstick for use with the external oil filter.
