I find it fascinating that there's a way to electronically adjust the definition of "full." It all makes much more sense now.

I guess this also means it's completely OK for the rest of us to run around 1L low on oil, since that's normal in an AWD car.

Thanks for documenting all this.

 

Agreed; like you (i'm assuming) I thought the sensors would be fixed.

Dave

 

Not necessarily; the AWD cars run with less capacity but it's the oil level that affects oil pickup heights, etc. Not sure I'd make that leap of faith.

Dave

 

I suspect that the mechanism is something akin to taring a scale, which is ludicrous for this application.

 

The dealer can adjust your sensor to read whatever setting he puts in there. For example, he could make it read 'full' with only 5 quarts of oil in there or 1/2 full with 7.5 quarts.

Welcome to the modern era of computers!

 

Not a comforting thought.

 

My remark was largely satirical, but if 1L low affected oil pick-up height, there would be an awful lot of vehicles w/ seized engines littering the highways.

 

Perhaps this should be a "Sticky". AWD customers need to know....

 

Indeed

:-)

 

Apparently you can be 2.5 qts below and the car does nothing to warn you, unless you're physically checking the level via electronics.

 

I just thought I'd put a note up here -- if you're taking your AWD R in, just be safe and check to make sure they're planning to put the right amount of oil in while you're getting checked in. I had my '16 in yesterday and, sure enough, they pumped in about a liter too much. I drove all the way home (about 60 miles) before remembering to check.

On the bright side, they dispatched their shop foreman to suction out the excess this morning, so I didn't have to go through the flatbed experience (or drive it back up while overfilled).

 

FWIW, the same goes for the AWD V6S.

 

6.5 liters is full on the AWD V8. 7.25 is an overfill!

 

And the same is true on the AWD V6. In other words, all AWD F-Type owners should be aware of this, but folks keep referring to it as a V8 problem only.

 

[
Before we continue, can we please universally acknowledge that I discovered this and that jag owes me a new car lol. Corporate should thank me, instead I get treated like I'm a crazy making this all up!

QUOTE=Foosh;1461254]And the same is true on the AWD V6. In other words, all AWD F-Type owners should be aware of this, but folks keep referring to it as a V8 problem only.[/QUOTE]

 

hmmm ... at Jiffy Lube they show you the dipstick
and insist you sign that it was shown to you on the
work order before starting the car, and before payment.

seems like a workable system.

 

Somewhere up above it is confirmed that the difference is 7.25 litres
versus 6.5 litres.

That's 0.75 litres nominal.

Hardly worth thinking about.

For a good example, look to the precedent of the 4.0/4.2 engines
and in particular the Silverstone Edition XKR.

There have been at least 3 dipsticks for those engines. Each with
a progressively higher level.

In the last iteration for the Silverstone, a new dipstick was sent
out that raised the oil level by 1 litre more than in lesser editions.

This was due to perceived oil starvation when cornering hard in
the Silverstone with its upgraded tires and suspension.

All documented and explained on JF in the past if you search for:

Silverstone oil dipstick

One engine casting, one pan, oil fill could be 2 litres different.

Depending on the year, for non-Silverstone vehicles, with oil cooler,
the AJ27 lists 6.4 to 7.4 US quarts.

I run "Silverstone" spec and in fact used 9.5 US quarts in mine
changing the oil two days ago after a 4 hour drain. 9 to 9.5 is
what I am used to using on previous changes.

I don't know why it is 2 quarts beyond the 7.4 nominal. I do know it
is where it needs to be on the dipstick.

According to "book thinking", this is up to 3 quarts above "book".
Don't care since it is the dipstick that rules.

 

Q. How much higher is the oil level if the oil surface is
50cm x 20cm and 1 litre of oil is added?

A. 1 litre = 1000cc
1000/50/20 = 1

The oil level will be 1cm higher for the given dimensions

I suspect the oil surface is somewhat larger than 50cm x 20cm
which would make the height difference even smaller.

You would have more than a 1cm difference in oil level just
running up or down a slope.

 

Bless you child. No offense, but would someone with some time explain to the gentleman above how an engine works and how oil pressure works? I this of it this way, you are increasing the oil pressure by about 25% when 2 qrts over. I can't imagine that is within spec.

Also, in my case, the dealer put in 8 quarts the instead of 6.5. They added to the 7.25 because most mechanics knew these things bled a little.

Also, I does it not scare you that the one biggest things the owners manual warns you about is driving with the oil overfill?




QUOTE=plums;1461880]Q. How much higher is the oil level if the oil surface is
50cm x 20cm and 1 litre of oil is added?

A. 1 litre = 1000cc
1000/50/20 = 1

The oil level will be 1cm higher for the given dimensions

I suspect the oil surface is somewhat larger than 50cm x 20cm
which would make the height difference even smaller.

You would have more than a 1cm difference in oil level just
running up or down a slope.[/QUOTE]

 

Well, either I'm a child or a gentleman.
Make up your mind.

No problem with how engines work.

In fact there is a good chance I was a mechanic,
back when they weren't techs, before you were
born.


Seems to be missing a word or two to make a
sensible sentence, but ..

Umm ... no.

Not even if you were talking static head pressure.

The oil pump is responsible for creating the pressure,
and will only flow what it flows. In fact, oil pressure
is a measure of the resistance to flow in the system.

So the time spent by the "someone" you called for
to educate me would be better spent giving you
some basic mechanical education.


You saw my approximation, which was done with a conservative
estimate of the surface area. The difference of 1.5L is still negligible
in real life.

And it's 6.5L from what? Oil capacities are quoted as nominal.
This is due to the fact that not every oil drain is the same.

You measure oil by level not volume.

What matters is the finished level. With a real dipstick
the usual method is to put in most but not all of the quoted
amount, check with the dipstick, then sneak up on it.

Finally, start the engine, check the idiot light or gauge
to ensure that the oil is actually building pressure.
Check for leaks while running, then shutdown.

Wait a few minutes, then check the oil level again
with the dipstick. Add as required to reach the desired
level.

The next morning after it has sat for hours, repeat
the check and adjustment as required.

Oil Change 101.


Dollars to donuts, the warning probably follows
the caution about not driving under full.

Far more likely to do damage. If you truly believe
otherwise, drop the oil out of your engine and
drive 10 miles on the freeway some night at or
above the speed limit.

Then you'll really have something to cry about.

As I said, I adopted the 'silverstone spec' for my
engine which was officially sanctioned for that
particular engine via a TSB and a specific dipstick
with a specific part number.

This was all hashed out in great excruciating detail
with participation from one of the best Jaguar techs
who happens to be a member on JF.

Running a quart high has been a popular practice
amongst car hobbyists for decades. When the car
is thrown around, it helps to maintain a good
supply of oil around the oil pickup so it isn't
sucking air.

Jaguar updated the owners manual for the V6 AWD,
but failed to update some of their other technical
documentation.

This may be annoying but the chances that this
has impacted the life of the engine are minimal
at best.

ps.

I've only ever paid for one oil change in my life,
and that was because I needed the diff filled while
out of town. The remainder were performed by moi meme.