OK so I did my first oil change on the car yesterday (and first one by myself in probably 10 years). I think the last time the oil was changed on the car was probably April 2019. Seemed to go ok. Replaced the oil with Mobil 1 full synthetic high mileage (car has 95,300 miles), replaced the filter with a motorcraft FL2021 (Wix was installed). Replaced the oil plug with a new one from Autohaus AZ. Old oil was pretty dirty - about a medium brown. New oil is/was so clear it's hard to see on the dipstick, but put in a little over 8qts. Started up fine yesterday. Today I drove it for an early morning Dunkin Donuts run which is about a 10 mile trip all in with local (30MPH) and local highway (50MPH speed limit). I ran the heater because it was a little chilly this morning. The whole trip took maybe 15 minutes. Everything seemed fine until I was literally pulling into the garage - like the nose of the car had just pulled in - then the Low Oil Pressure warning came on! I only had another 15 feet to go, so I pulled in and turned off the engine. Waited for everything to cool down and checked the oil level and it's still full. I checked under the car and no leaks or drips from the filter or the plug. I'm not sure what to do now and am worried about turning the engine back on.
Any suggestions?

 

Over here in the UK it's mostly cold so i use and have done for the last 8yrs of ownership 5w 30 fully synth & K&N filter, having covered 65,000 miles since 2005. Your right to not re- start the engine if your not seeing any fluid on the floor, i've not heard of an oil pump playing up after a simple oil change!! The only other component i would look at would be the oil filter you have used...are you sure its a good one, nothing blocked inside the filter and is the right one for your engine?
You could always drop and save the oil and just replace the filter with a K&N or better than what you originally fitted, i'm sure one of the techy guys will be along soon to give alternative prediction. TS

 

Cheapest/easiest thing to try would be to replace the oil filter. I use the Motorcraft FL2021 filters on my 4.0 engines (x308 cars) with no problems.
Could just be a faulty one?

Next thing to investigate would be a clogged oil pickup screen?

 

Thanks for the response, T. From what I can tell, the variables are: type of oil (I don't know what was in there before - perhaps not synthetic?), filter (I noticed my replacement filter was shorter (not as tall) as the Wix on the car. I'm pretty sure the last service the car had was at a Jaguar dealership in Tulsa, OK. If anyone can chime in on what kind of oil they use, that would be helpful.

 

Maybe unplug the sender and clean the contacts, check resistance across sender contacts.

 

If it was my car I’d waste no time in hooking up a mechanical oil pressure gauge to see without any doubts what the heck is really happening.

once you have that critical information, then and only then can you know which way to proceed.


sending unit or other electrical malfunction is the usual culprit , but this is no time to be guessing. Get that read on the oil pressure with your first turn of the key.

Z

 

I had a motor that I just put into an Xk8. The motor had been sitting for 4 years. It was showing low oil pressure at idle. Replaced the oil pressure sending unit with a new one and now shows normal pressure.

 

PS. I’ve used the Ford MotorCraft FL-2021 Oil filter also, without any issues. However I do prefer the Jaguar branded filter if only for its larger size and use them unless the Jag filter is back ordered which has happened a time or two.

Z

 

The 4.0 filter is longer than the 4.2 filter but there is no difference otherwise.
I just keep the FL2021 in stock for BOTH the early and later Jaguar V8 engines.

Remember that the Jaguar boxed filter for the 3.0 V6 (S-type and X-Type) is just the Motorcraft FL400S.
The box says Jaguar all over it but the filter says MOTORCRAFT FL400S all over it.

 

As stated the oil fllter, the low oil pressure switch and a clogged sump are by far the most common oil pressure causes. The oil pump itself rarely fails.

The low oil pressure switch (it is not a true analog sender!) is available for as little as $10 aftermarket from many sources and easy to replace.

If those easy and cheap fixes do not resolve it, then drop the oil pan. The sump often clogs with bits of plastic from decaying tensioners and guides. If you find this is is a red flag to replace your chain tensioners and guides before they damage the engine.

 

It's a 2005, so it should have the metal tensioners, right?

 

Yes, but the plastic on the chain guides and the plastic bits on the metal tensioners can still disintegrate. It may not be as urgent a hazard as on the 4.0, but it still can eventually cause issues.

 

Ah, I didn't know that! Interesting...the more you know...

 

Ouch, I had no idea either!

 

After all that, it was just the oil pressure switch. Whew. Although it was a bit of a confidence killer that the darn thing went on the fritz right after I did the oil change. Welcome to Jaguar ownership, I guess!
Thanks everyone for the help and suggestions.
Also I don't believe I have an engine oil cooler. If I had one it would be above or near the PAS cooler, right? Nothing in front of the radiator except that power steering cooler on my XK8. This is a bit of a relief. One less thing to R&R.

 

Eh stuff fails; I had this same thing on a Corvette I owned and I freaked out until i verified oil pressure, wiring, tested the sending unit and then replaced the sending unit; which was right above the oil filter on the L98 IIRC and not surprising they get jacked over time.

Nice on it being minor though!