Hi
I’m new owner of 2015 Jag FtR
having trouble with checking the oil level
i get message - measurement not available
what’s the typical procedure ?

 

You need to wait 10 minutes after switching off before the level is available. Make sure you're on a dead level surface, any slight incline will give false readings (e.g. overfilled if pointing downhill, however slight).

 

And even easier: take the measurement before the first run of the day.

 

doesn’t work like that

 

Why not?
It's when and how I check my oil level and it has never failed me.
There is an argument that taking the reading with cold oil gives a false lower than factual level coz the cold oil takes up less room in the sump than hot or at least warm oil ie what you would have if you followed the JLR recommended procedure of warm the engine up, switch off then wait at least 10 minutes, and you took the reading shortly after the 10 minutes had elapsed.
Thing is, I have followed this procedure a few times as well as taking a reading with a cold engine left overnight and it makes no different at all, every single time the exact same reading of smack on the "Max" mark!
IMHO the volume of oil between hot and cold oil changes very little, by less than the gauge can measure.

 

That is my observation as well.

 

Of course it does! I check mine that way. The reason there is an instruction to wait 10 minutes before checking on a hot engine is to permit all the oil to drain down into the sump so that the reading will be accurate. 10 minutes or overnight, the reading is just about identical.

 

What would we do on this forum without our quirky oil level measurement system?
I suspect an element of mischief from Rallyogre as their comments were not expanded to explain how it was done.
Anyway, OzXFR and Unhingd have spoken, so that's the end of this thread.

FYI - I obtained definitive data a while ago from my Jaguar dealer when checking an oil overfill;

Intial Checks:
The calculated Engine Oil Volume: 6.5L (sump oil temp: 20°C) - Shows as OK on vehicle display.
The calculated Engine Oil Volume: 6.6L (sump oil temp: 90°C) - Shows as over-filled on vehicle display.

So with a hot engine, the oil volume increased by 0.1L, or 1.53%.
(This is on a MY 2018 3.0 litre 380 AWD V6)

 

Frank, I recently had my annual service at Paramus Jaguar in NJ. I make it a ritual to check my oil level before taking her out, takes a couple seconds, and tire pressure also, and the level showed full. After the oil change I noticed a change, when cold, it was a tick below full and fluctuated between low and full. Since I owned her (August 2019) It always showed full. Concerned I called AJ ( Anthony Nuguyen service advisor) and he said bring her in the next morning. When I arrived I also mentioned a vibration at 85 mph and possible differential whine. AJ immediately sent my jag to check alignment, slightly off, and Connor drove my jag and and said whine probably tire noise (? Will keep my ears open) and check oil level reading. AJ said Oil when cold will show slightly low and when viscosity is warm shows full. Checked when home and on subsequent roads trips, always following CDC protocols, AJ was spot on, all ok. Paramus Jaguar serviced my Jag on two occasions and I was in and out in two hours with a car wash. AJ and Connor (technician) will be assigned to my Jag when serviced and Connor said he would be available for answer any questions I have, and he has. I would recommend Paramus Jaguar to owners in area.
Frank MY 16 S coupe storm grey with brogue interior ivory stitching performance seats.
Hudson Valley NY

 

Oil level in the morning = overfilled.
Oil level 10 - 15 minutes after driving = 2/3 to full. And this is ok, told me the Jaguar chief mechanic - Never check oil in the morning.

Greets Thomas

 

This link has the coefficient of expansion for motor oil at 0.00039/degree F or 0.0007/degree C

https://www.engineeringtoolbox.com/c...ts-d_1262.html

Looks like a 100 degree F change in temperature is about a 3.9% change in volume. For a 7 liter fill that would be about 0.270 liters.

 

Thanks for the vote of confidence!
Anyway, I got back in this morning after a long enough drive to get the oil up to full operating temp, then I let it sit for about an hour before checking the oil level.
As per usual smack on the max mark.
But when I hit the start button I watched the temp gauge reading climb, it took around 7 or 8 seconds to go from the bottom (dead cold) to about 90% of the way to the normal hot mark. So I would guess the oil temp was around 90% of "hot" and still zero deviation from the level it reads when dead cold.

 

Can't resist joining in an oil level thread, to add to the speculation about oil level variation with temperature change , most liquids increase volume with temperature. I remember auto transmission oil dipstick had level marks for cold and hot.

The ultrasonic oil level sensor fitted to our F types also measures temperature so should if this data is used be able to compensate for different temperatures.

 

If anyone is obsessing over a 9 ounce reading disparity....Get a life.

 

No worse than a fascination with non functional tow hooks.

 

I get that. Just trying to fill that damned hole in the grill.

 

From my reading of pages 69 and 70 of the AJ133 Technical Training doc (attached) the oil level and oil temp sensors are effectively separate and don't talk to each other.
Like you I thought that maybe just maybe the sensors were smart enough to adjust the oil level readout for oil temp but now I don't think so.

Edit - but then again, what is the point of the oil temp sensor?
And what is it used for?
The temp gauge and warning on the dash is about the coolant temp not the oil temp and I have never read of any use for or warning of the oil temp.
Maybe it really is used to adjust the oil level readout!

 

Seems like an optimistic description of the sensing system's capabilities!

EG, "All marginal influences are compensated for by averaging". If this were true, parking on a slight slope wouldn't show such a difference VS level ground...