I bought a used car once that was so sludged that when I removed the valve cover to adjust the rocker arm lash I could not see the rockers or the push rods. Back then my wife was my girlfriend and I had her go get the shop vac so I could vaccum out the sludge as I scraped it out with a putty knife and screw driver. The valve cover was completely full of sludge. After this I ran 1 quart of MMO and 4 quarts of Castrol 5W50 Syntec through it at the next 4-5 oil changes. Then from their on out I just used 5W50 syntec in it. Latter that year I went down to visit Mom and Dad and to let my parents meet my girlfriend. I dropped the oil pan at that time and had to shovel the sludge out of the pan. That was about seven years ago or more and that vechile still drives to this day and does not burn a drop of oil. That was a 1982 Toyota Starlet it either has the 3KC or 4KC engine in it. It is a little pushrod engine.
When I bought it their was O oil in the crank case and no battery. It had been sitting in a field for 2 years. I put 4 quarts of oil in it and a bottel of B-12, changed the plugs, cap, rotor and wires and battery. I sprayed B-12 carb cleaner down the carb and it fired right up!
