Question about 1995 Mazda 626

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Probable cause of oil leak upper portion of oil filter

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What upper portion are you talking about? Between housing and engine block? or where filter screws onto filter housing? If its where filter screws on sometimes when you chg. filter and you don't watch what your doing the old rubber Oring will stick on housing and you spin on new filter and it will leak because it will not seal because of the old Oring. Now if its comming from between the housing and block you will have to remove the housing and install a new gasget between engine block and filter housing.

Posted on Feb 24, 2009

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Check the oil filter and make sure there is only 1 gasket because these motors are known for the old gasket to stick to the engine.So when you put the new oil filter on it will leak badly.

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So there are obvious drips on the floor then?
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Hi there:


A clicking or tapping noise that gets louder when you rev the engine is probably "tappet" or upper valvetrain noise caused by one of several things: low oil pressure, excessive valve lash, or worn or damaged parts.

First, check the engine dipstick to see if the oil level is low. If low, add oil to bring it back up to the full mark. Is the engine still noisy? Check your oil pressure. A low gauge reading (or oil warning light) would indicate a serious internal engine problem that is preventing normal oil pressure from reaching the upper valvetrain components. The cause might be a worn or damaged oil pump, a clogged oil pump pickup screen or a plugged up oil filter. Using too thick a viscosity of motor oil during cold weather can also slow down the flow of oil to the upper valvetrain, causing noise and wear.






Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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I really doubt that the oil filter housing could be cracked by having a new filter put on. The spin on filter's sealing "O" Ring was probably pinched or left off or mis-aligned causing it to leak. With the proper "O" Ring, and seated correctly the spin on filter only has to be hand tight. If it is leaking, take it back and complain.

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I have a 2005 pontiac gxp that has been using oil and antifreeze but I checked the antifreeze and there are no signs of oil and also the oil dipstick has no antifreeze on it either.....I used about 3...


If you have the V-8 Engine, just totally disregard this post.

If you have the 3.8L V-6 engine, your oil consumption problem is most likely to be caused by the PCV Valve if you cannot find any external leaks. These are also known for the upper intake plenum leaking antifreeze. The ports in the manifold that go to the throttle body are made of very thin plastic. The EGR tube, with its hot exhaust gasses, goes right between them. This causes the plastic to heat up and crack, causing an antifreeze leak that goes directly into the intake and gets burned in the combustion chambers.

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By the time you remove your oil filter, you should have a good visual check of the oilpan and oilplug. The oilplug can be stripped if someone crossthreaded or overtightened the nut. There are oversized oilplugs and repair adapters available to work around the problem.

In the event you have a hole in the oilpan, with a good cleaning, a product called JB weld can permanently patch a hole. Your motor has 2 main openings where the crankshaft is attached. Each end has a seal and you have major disassembly to replace inexpensive seals. The upper portion of the engine has valve covers and they are easily replaced.

Do 1 thing at a time and go by the evidence. With luck this may be a simple thing to fix. I hope my solution has been helpful to you.

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The loss of coolant, overheating and running bad could add up to coolant leaking into the engine. The Dexcool antifreeze used in the GM vehicles has caused gasket failures in the upper air plenum and the lower intake manifold. This could allow the antifreeze to be pulled into the combustion chamber and the oil. If there is no visible external leak, then this is probably what's happening. Sometimes the gasket leak will show up as a very small and difficult to detect puddle somewhere around the gasket/engine mating surfaces. Also look for signs of coolant in the oil. If it has gotten into the combustion chamber, then it has probably ruined the O2 sensors and catalytic converter. The only solution is to pull the upper and lower intakes and replace the gaskets. Change the oil and filter. DO NOT put Dexcool back in the radiator. Use a green antifreeze that is labeled compatible with aluminum engine parts and radiators. Replace the O2 sensor. The catalytic converter might have survived. Get it running first, then worry about the converter. Good luck to you, and try to have a Merry Christmas.

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oil_cooler.gif

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