My 1976 AMC Matador has purged a little motor oil down into the exhaust and muffler- why?

After 12 years of inactivity(65,000 original miles) I brought it back to running and have already driven 200 highway and city miles. It always starts up just fine. The oil light comes on after 5 minutes idling and disappears when I give it some gas, returning when I let off the gas.My 1976 AMC Matador has purged a little motor oil down into the exhaust and muffler- why?
This is two separate questions.





1. Oil in the exhaust means the rings are most likely shot. Maybe some rust built up while it was sitting





2. Oil light on means low oil pressure or bad sending unit





You're probably going to have to rebuild the motor.My 1976 AMC Matador has purged a little motor oil down into the exhaust and muffler- why?
First off if you had this problem before you put it in storage it could be a number of things wrong. However if everything was fine and working be fore you stored the car then you probably only have a clogged up oil sensor. Some times you can on clog them by removing them and spraying carb cleaner or brake clean in them to wash out the old oil. But, there is a slight chance the oil pump pick up is clogged. This is a screen on the end of your engines oil pump that filters the oil before it goes into your engines critical parts. I have seen some of these screens clog up really bad. This could do some serious damage to your engine if it is clogged and you continue to drive it. Check that sending unit out right away. If you clean it and you still loose pressure you really need to put a mechanical gage in place of the sender and check to see what your actual pressure is when the engine is up to normal operating temps and idling.





Hope this helps
I am ASSUMING that you changed the oil, %26amp; filter ! ? If not, do so NOW, Leaving room for 1 pint of STP oil treatment ! Change the spark plugs ! Then fill the gas tank with 92, or 93 octane gas,and add 1 bottle of STP gas treatment. Drive it for about 200 miles ( the piston rings may be ';stuck';). I have been a mechanic for over 50 yrs. !