I changed the oil today on a 91 S15 Jimmy that I swear was the original oil that the truck left the factory with! When I managed to get the drain plug off (which was on there real tight!) The oil came out like tooth paste. It stuck out of the drain hole at an angle, then fell off. It kept doing that for a few min then would gush out like normal, then plug up and go back to the tooth paste thing. I ended up sticking my pocket knife in there and swishing it around to loosen the crap up and keep it flowing. I have refilled it and will let it run and drain again. The guys gets to pay for 2 oil chages now because of the lack of maintenance. I cant believe the thing even had oil pressure. I have seen some cars in need of an oil change before but this was ridiculous!