Question about 1995 Jaguar XJ6

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Oils pressure gauge fluctuates

I have a 1995 Jaguar sovereign. On starting the oil pressure gauge reads ok. However as I drive and I stop the oil pressure gauge drops to zero and the oil indicator light goes. When I start moving again or rev the engine the pressure climbs up and the light goes out. I checked the oil level and it is ok.

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Check the oil viscosity,it might be too old(driven for toomany miles)..

if thats not ityou might need to get the oil preasure lubricating pump checked,and id suggest you do it fast or theres a lot of engine wear and tear.

Posted on Aug 05, 2009

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Make sure the oil is 20w50. That will hold up and is the spec for the engine.

Posted on Aug 12, 2009

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1 Answer

My oil gauge is going back and forth on my 1996 Ford F250, I have change the oil coolant sensor. When I drive a few miles the oil gauge goes crazy. Need help? I have change the oil sending unit also.


The oil temperature sensor could be in the oil level sender unit - it depends how many connecting wires there are. If it is in there it would not be as accurate as if it is placed in the main oil gallery, perhaps combined with the oil pressure sensor.

I advise you to re-read your vehicle handbook and ensure you know the exact functions of the instruments. Often the oil gauge is a level gauge only until the engine is started and then becomes an oil pressure gauge, therefore a fluctuating gauge might indicate a fluctuating oil pressure...

If that is so, worrying about it now could save worrying more expensively later.

Mar 06, 2017 | Ford Cars & Trucks

2 Answers

When the engine warms up in my 2000 Grand Cherokee, the oil pressure drops when I stop. It rises when I am driving, but starts to drop immediately when I slow down or come to a stop.


Oil pressure depends upon the viscosity of the engine oil. As the engine heats up the oil becomes physically "thinner" and therefore pressure goes down a bit. The oil still protects the engine parts though unless it has been contaminated with fuel etc.
That said, Pressure can also become lower if the oil pump pickup screen is partially obstructed (happens from using inexpensive high paraffin based oils that burn off leaving hard carbon and sludge residue behind). That will restrict oil flow and make the fluctuations of pressure larger and more noticeable.
Another cause of low pressure is rod or main crank bearing wear. That allows oil to flow out the sides of the bearings instead of holding normal pressure. Eventually the wear increases and the engine begins to knock and later fail.
If your oil pressure is around 40psi when driving and goes down to 20psi at idle, that's still safe.
Some people accept 5psi at idle as normal but it isn't. Anything below 15 should be considered as time to investigate further and do whatever repair is necessary. Testing should start with attaching a mechanical gauge to the engine and reading actual pressure. (your gauge is electro -mechanical and can be off a bit). You can get some residue out of the engine safely by using marvel oil along with each oil change. It will slowly dissolve residue and the filter will collect it.
Always use a good brand name quality oil. Generally a 20w 40 or 50 is good. Synthetics are even better but by nature can give lower than normal pressure readings (they are physically thinner but offer higher wear protection than conventional oil). Lucas additive is a good viscosity index improver and can be used alone or with the marvel oil.
If your bearings are indeed worn, there is no chemical known to man that will correct your problem though.
OK lots of info....hope it helps either for you to better understand what is happening or how to fix it.!!
Questions??? ASK

Nov 28, 2010 | 2000 Jeep Grand Cherokee

3 Answers

Oil pressure gauge fluctuates from high to low. What could be the cause? Remedy?


Hi. This will indicate that there may be some sludge build up in the block, or the oil pressure switch may be damaged. The more serious issue will be a failing oil pump. To isolate the issue, simply, have a oil pressure test ran on this engine. If the test indicates that the true oil pressure is optimal at idle, kindly replace the oil pressure switch. Now, if the test proves that the pressure is indeed lower than factory specifications, this will confirm that the pump is damaged. Have the pump, and oil pump screen replaced, in this case.

NOTE_ I would, also, recommend to have the engine flushed asap.

Jun 03, 2010 | 1995 Ford Crown Victoria

1 Answer

1995 Jaguar XJ6 oil pressure gauge


This is OK. Oil pressure is always higher when the engine is cold.

As an engine accumulates miles the pressure will start to drop due to bearing clearances increasing.

If this just started to happen you may want to replace the oil filter and or oil pressure sending unit.

Sep 22, 2009 | 1995 Jaguar XJ6

1 Answer

Oil gauge fluccuates,while driving. Indicates zero when stopped at traffic light, then gradually moves up as accelleration increases. The only time I get a normal oil pressure reading is at start-up. Dip...


You should have a manual oil pressure test done but this condition idicates the oil pump is weak or the high pressure bypass is sticking open.

Jun 22, 2009 | 1986 Jaguar XJSC

2 Answers

Low oil pressure light is on


Until u have a mechanical test gauge hooked up to verify the oil pressure is ok assume it is not a good idea to drive, low oil press will destroy a $4000.00 engine very quickly.

Jun 17, 2009 | 1995 Chevrolet Camaro

2 Answers

Fluctuation on the oil pressure gauge reading


The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

Nov 24, 2008 | 2003 Toyota Sequoia

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