There is a massive oil leak on the passenger side of the motor
SOURCE: 2000 Mitsubishi Galant, EA3A 2.4l motor. Oil leal
it could also be the oil pan gasket, or the manifold gasket. if it's the manifold gasket, when you remove the manifold to replace it, take the time to clean out the mixing chamber. it'll be filled with gunk and cleaning will improve gas mileage.
SOURCE: oil leak
I suggest cleaning the engine to help you isolate the leak location. Keep in mind that oil tends to flow down and back, so follow the trail up and forward to find the likely location of the leak.
The oil pans on my three 90-93 Accords have been notorious leakers, relatively easy to replace.
Another notorious leaker is the oil pressure switch which is mounted on the back of the block above the oil filter.
If it is primarily on the passenger side, it might be the 'rear' seal on the engine behind the flywheel. To replace this seal, the transmission and flywheel have to be removed. The seal can be purchased already installed in a plate which bolts to the right (passenger side) of the block. A Haynes manual has sufficient instructions for performing this work.
SOURCE: 2000 Mitsubishi Galant, EA3A 2.4l motor. Oil leal
don't use 20w50 that is too heavy an oil for that motor. the most i would use is like a 10w40 and that is a last resort. your valves need adjusting or the hydraulic lash adjusters may be gunked up. there is a chemical called auto-rx (search web) that could help you out. just follow the directions for it. the only other oil seals i can think of are oil pan gasket, oil filter gasket, rear main seal, valve cover gasket.
SOURCE: 2002 chevy trailblazer with massive oil leak.
oil pan, or rear mainseal housings are common leaks on these... also if 4wd, diff runs thru oil pan..
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