Mitsubishi Montero & Montero Sport This sport utility vehicle offers more size than the other Mitsubishi SUVs, but manages to keep a sporty look and comfortable feel, unlike many larger SUVs.

Leaks everywhere

Old 03-05-2019, 10:16 PM
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Arrow Leaks everywhere

I bought a 2002 Montero sport. I noticed that wherever i go, there's a trail of oil ledt from under the car. There is a "multiple mis-fire detected" code, but no check engine light. Where can the oil be ;eaking from? will lucas additive work anymore at this high mileage?

Last edited by skompel2; 03-05-2019 at 10:18 PM. Reason: - N/A -
Old 03-06-2019, 07:30 AM
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02 Montero Sports typically leak from their valve cover gaskets, the rear camshaft covers, and the front cam seals on each head. This is not a design flaw--those gaskets and seals are just 16 years old and have hardened. This leak on the (US) passenger side often leaks onto the alternator, causing it to fail. Replacing these three seals requires taking off the upper and middle intake manifolds (3 sections). Not a tame job at all, but I just did it successfully, working very slowly, in 10 hours or so. I did my timing belt, relevant pulleys, belt tensioner and water pump, plugs and plug wires at the same time and also replaced the three oil seals on the front of the engine while I was there--the two camshaft seals (behind the cam gears) and the main crank seal (on the crankshaft behind the crank gear and behind the crankshaft position sensor).

While you are there, clean your throttle body, your idle air control passages, your EGR valve and passages, and your PCV valve.

The other likely source of oil leaking is from your rear main seal, on the crank shaft, where the engine mates with the transmission. I don't know when I will get to mine.

Lucas additive will not likely work. It almost never does in my experience.

Last edited by jburney; 03-06-2019 at 07:32 AM. Reason: Complete answer
Old 03-19-2019, 08:28 AM
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I have to agree. I have an 02 Montero Sport that I have gotten really good at changing the alternator. That pesky valve cover leaks right on to it and in a few months bam it goes bad. I'm in the process of tearing this thing down and I want to change every single seal I can to stop the leaks. Currently it has just been way easier to swap out an alternator.
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