When I popped the cap off of the oil drain tube on the bottom of the crankcase no oil comes out even though the dipstick shows it to be full. I tried poking a thin wooden dowel gently into the open to see if there was just some gum blocking it but nothing came out. I have been running the mower for 6 months without any issues other than a good bit of smoke upon starting if it has been sitting for a few days. I suppose I should just unscrew the oil drain tube and see if any oil comes out which would indicate an issue with the drain tube meaning that it should be replaced?