94 Grande Marquee leaks oil most common issue

the smell could be oil leaking on to the exhaust from the rocker covers.(common problem in Subaru because of the side mounted pistons. Engine stop oil leak might fix other wise will have to get tappet cover seals replaced as they crack over time from the heat) easy enough fix. a tell tale sign is signs of engine oil stains or signs of oil dripping on to the exhaust(can locate by looking under the front of the car at the bottom of the engine itself) and this is probably the cause of the engine knock due to low oil.it will continue to leak till the problem is fixed

Dear Sir,
Here is the oil leaking Problem Identifying Technique

Engine oil leaks from the valve cover gasket are common.

The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.

External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.

Engine oil leaks at the distributor can be misdiagnosed as leaks from theintake manifold seal, oil pan gasket, or rear crankshaft (rear main) seal. A revised distributor is available if oil is found inside the distributor.

If the oil filter casing shows signs of distortion from excessive oil pressure, theoil pump should be replaced.

Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.

Carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

I think it helps to analyse u r Problem

How long is a piece of string ? without a good look under the bonnet i couldnt say but make sure the engine breather is clean and not clogged as this would cause a build up of back pressure which will cause the oil top leak from everywhere possible

First thing is to make sure the oil filter gasket is on and that only one is on it and not two. You want to make sure the oil filter is sealed properly to the oil filter housing first because this too can cause oil to leak. This can be a common mistake. Remove the oil filter and double check the oil filter has only one gasket on it and make sure it is not spit. Put the oil filter back on, with one good gasket, and clean the area up and top the oil off to proper fill and then start the vehicle and look at the filter as the engine is running. If you see no leaks after a few seconds then this may have been your issue. If you still see oil leaking the you will need to remove the oil filter and remove the oil filter housing. One of the "O" rings inside might have cracked or shifted. I recommend not driving or starting the engine until this issue is repaired.

A common problem with leaking oil filters is that they were either cross threaded or the old rubber gasket stuck to the filter mount and now there are 2 filter gaskets there which could leak. As far as the oil sensor you amy be able to tighten it down after removing the wiring harness to make it stop leaking.

1995 Ford Windstar 3.8L Engine Knocking noise on top side of engine near center of Air Plenum. Engine was completely rebuilt 2 years ago (28,000 miles on Re-Built Engine/ 156,000mile on Van). Coolant level is SAT, Engine oil level is Sat. Van was driven 2800 miles since last oil/filter change. Engine started surging as van slowed down to make a stop then engine shut off. Restarted engine and heard knocking noise. Shut engine off immediately. The oil light flickers on dash with engine running. Do fuel injectors make tapping noises when degraded? Is it possible hydraulic lifter not able to leak down or does not fill with oil? Oil pressure issue with the dash light flickering? I can see if the engine has allot of miles on it, the intake and exhaust valves begin to leak-by how ever this not the issue. Where do you start to locate engine knock noise? How is oil pressure checked to see if pressure is too low? Any help where to start would be appreciated.

Sounds like it could be the oil pressure sensor. Very common for them to leak on older vehicles.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Dear Sir,
Here is the oil leaking Problem Identifying Technique

Engine oil leaks from the valve cover gasket are common.

The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.

External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.

Engine oil leaks at the distributor can be misdiagnosed as leaks from the intake manifold seal, oil pan gasket, or rear crankshaft (rear main) seal. A revised distributor is available if oil is found inside the distributor.

If the oil filter casing shows signs of distortion from excessive oil pressure, the oil pump should be replaced.

Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.

Carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

I think it helps to analyse u r Problem

The oil pressure switch could be leaking. It is common on the 2.8 V6's. Clean the area off w/ engine degreaser, dry it off, then let run for a few minutes to verify the location of the leak.

You need to clean the engine and then run the vehicle while watching the area. The most common failure is the oil sending unit located near the oil filter. I have also seen a leak develop between the oil pump housing, which is mounted directly behind the hamonic balencer and the engine block.