Hi guys,
Today when I started out this morning, my coolant temperature quickly reached the N line, normally its under this. And the oil pressure was about 85 psi, usually its in the middle or just above.

Why would this be? I'm confused was running fine on a long journey and in traffic last week.

Thoughts appreciated.

Thanks

 

Sender playing up, gauge playing up, relief valve a bit sticky. Oil system not playing up!

 

All of the above? What does your message mean?

 

Any of the above could be at fault. But because your oil pressure gauge and water temp gauge both showed different readings, I'd be checking instrument cluster grounds. Common issue. There's a write up about it in Kirby Palms "Book" in the stickies above.

 

I have just overhauled the entire cluster and tested every part of it recently.
Was working normally until today. Maybe its the weather change?!!?!?!

 

HA,

It be lockdown, Jag gone pissy.

Those 2 gauges being odd are classic earth issues at the cluster, hence the dedicated extra earth wire, outside the loom, as suggested, is the 95% fix.

Next is digging around, spending money, etc, NAH.

 

Normally oil pressure drops like a rock when it get super hot. Has to be a faulty common ground making the resistance higher.

 

Might take the car out later and hopefully might have sorted itself out over night?
Fingers crossed.

 

At least yours work lol. I've never seen my oil pressure lol.

 

Well as soon as I put the car on it started to rise all the way up to about 80. I'm almost certain it never did that before. Either it finally cleared a blockage and this is normal or something is not right 🤷🏻‍♂️

 

I read that the different weights of oil will effect it as well. Didnt change from say 5w30 to a 10w30 ro something like that?

 

The oil . has been the same since it read last serviced 2 years and 6k miles ago. I did go on a long intense trip to London, M1 then stop start around the city. That was last week was fine.
This started to happen after I accelerated quite hard yesterday 🤷🏻‍♂️
I'm not sure what oil they put but I go to a good garage no cutting corners.

 

You havent changed the oil in 2 years?

 

I wasn't driving the car regularly....but have been for the last year or so....

What are your honest thoughts.... : (

 

So oil will lose its viscosity over time regardless.of engine running or not. Hence why when people.like myself store motorcycles for the winter, once spring comes, we change the oil.

I've put maybe 3 km on my xjs since I got it and I've changed then oil twice now. And I'll be doing another one this winter as I tear the engine down.

So if its gonna sit for say 4 months or more I would change the oil after that. If you are using it a few times a month then change it every 6 months. If it was daily driven then 8k to 10k km I would change it.

Might be reading high because its thick. Fresh oil change doesn't hurt.

 

Where did you get that info from? Loses viscosity sitting on the shelf?????

 

Didn't say on the shelf. In the engine.

So you are saying i shouldn't have changed the oil in a car that sat for 4 years?

 

I think you will find the sender on a 95 I6 is a switch not a sender at all. Mine was on my 94 anyway. So it should always read the same if you have at least 10psi or whatever. Pretty useless but they got less complaints about oil pressure fluctuation that way apparently.

 

What is the difference between the two. I'm not saying that, I am saying I am against people spreading misinformation on forums. Sounds like an old wives tail. I have 10 cars, if I changed the oil after 1 year on most it still comes out like new. Find proof and I will be interested.

 

The reason manufacturers recommend changing the oil after a specific time Regardless of mileage is because of water vapor contamination. Not because of a change in viscosity. Sure, enough water vapor will change viscosity but we are talking about tiny amounts of water vapor- not quarts. As your vehicle sits unused, heating and cooling cycles from the environment can cause tiny amounts of water to condense inside the engine block which can contaminate the oil. But I’ve never really found it to be all that significant. That is also the reason why oil has a two year shelflife sitting on the shelf in his original container because the plastic container will allow slight amounts of water vapor to move through the plastic and the oil

this condensed water becomes a real problem with short haul trips because the engine heat causes more vapor to condense and less to be boil off so oil sludges more with lots of short trips. More so that when an engine just sits there unused