I've posted this before at approximately 100,000 miles. I've owned
the vehicle since new, and average about 5,000 on each oil change
using non-synthetic oil. The majority of the miles (probably 90%)
are highway miles. Every second or third change, I have the company
do a TBN or Total Base Number which indicates the remaining percentage
of additives; the longest miles I've driven between a change was
7,300. The TBN was around 2, indicating that the majority of the
additives were used.

I've attempted to attach the report to this post; In case it isn't readable,
the comments were: "Your Jag certainly doesn't give us much to talk about, but that's good news for you. Even though it's been nearly a
year since we last saw this engine, there's nothing unusual present
in this sample. Metals are still low and steady, and there was no fuel,
moisture, coolant, or other contamination present. Insolubles read low
showing excellent combustion and oil filtration characteristics. If all
engines looked this good, we'd all have to go out and get honest jobs.
Nice report."

For what it's worth, all the changes have been done at a Jag dealer;
However, that may change in the future as the dealers appear to be
going stratospheric on their prices; recently a dealer in Northern
California tried to bill me $160 dollars for a change; no, synthetic
oil was not involved, just a garden variety oil change.

I've also been changing the air filter annually, or about every 20K
miles. Oh yeah, it's a 2006 NA 4.2. It appears if you maintain these
engines well, they should go the distance. I suspect I'll keep the
old girl a few more years. Outside of normal wear (brakes, etc),
a DCCV and CCM, and the transmission cooler lines, it hasn't given
me any grief. The dealer offered me about the same as I could get
for a 20 year old Honda Civic. The interior/exterior are just about
perfect; but that's the reality of the situation: Nobody want's a
high mileage Jag.

 

Great stuff!

I wanted and bought a quite high mileage jag and plan to go on running it as long as viable. Great value motoring in a great car

That'll jinx it...

 

Thanks for the info. This supports my view that these cars live long and healthy lives on plain old dino oil.

 

Sounds good, thanks for the info.

$160 for an oil change, if you can, do it yourself, it's less than an hours work.

 

Agreed. Doing your own oil and filter changes is the way to go. Buy when your preferred oil is on sale and stock up on your garage shelf. Then you'll be ready to do the job whenever your preferred maintenance interval rolls around. Been doing this for decades and have saved many thousands of dollars on many different vehicles as a result....

 

I agree with Jon. I change the oil on all of our cars and save a lot of money, and to be candid, I kind of like it. I, too, use conventional oil.

But back to your oil analysis, glad to hear your engine is still in great condition. May it last as long as you need it to.