I've posted previously about oil analysis; I've been using it on my 06 4.2S NA since new. I've been averaging about 4,600 miles per change, and, to
date, the engine has burned less than a pint of oil, and that was during
the first 3.000 miles.

Hopefully, you can read the attached analysis; if not, pm me and I'll send
you a more readable copy. As you can see from the comments, the wear
metals are minimal. Is it a good engine? I think so.

In addition to the standard analysis, I ordered a TBN, or, total base number. Essentially, this is the amount of active additives remaining in the oil, with 7 (100%) being the starting number. I don't want to get
caught up on the oil change debate, except that I feel that about 7,000
miles is the most I'll ever run before a change; while it may still lubricate,
I don't want the additives falling below 2.

This engine has been babied since new, spending most of its life in
temperate climates and running between 1,500 and 1.700 RPM with
about 90% highway driving. Once a month or so, it gets an 'Italian
tuneup' and occasionally goes close to red line if some rice rocket
issues a challenge.

For those of you running this engine, or considering the purchase of
a 4.2 engined Jag, I believe you can form a decent opinion re: longevity
based upon this info.

Cliff

Interesting..... how about the gearbox oil? Or diff?

Actually, out of curiosity, I had the transmission fluid analyzed at
83,000 miles. The report indicated "universal averages show typical
wear metals for an oil from this type of transmission after an average
of 23,000 miles run on the oil. You kept this oil in place for a high
83,000 miles and wear is still mostly around average. Copper is the only
thing that's high, and it's more than double the average. It's probably
from normal accumulation and not a problem. We can also tell it was
time to change based on the insolubles. Yours are not all that high at
0.1%, but 0.1% is the limit for ATF. No moisture was found and
all other parameters are o.k."

The copper read 233 ppm; universal averages are 92. I have no idea
where copper is used in the transmission.

A few weeks ago, I had the diff fluid changed at the dealer (it has
to be aspirated out rather than drained) at 96,000 miles. Didn't
bother to run an analysis.

Thanks.

Good stuff!

Could you post up who you use and the cost?

This engine has been babied since new, spending most of its life in
temperate climates and running between 1,500 and 1.700 RPM with
about 90% highway driving. Once a month or so, it gets an 'Italian
tuneup' and occasionally goes close to red line if some rice rocket
issues a challenge.

The results are good for an engine of those km.
How do you spend 90% of your time on the highway at 1500 - 1700 rpm??

Thanks for your taking time and posting this , I am sure it will give an opinion for anyone who is interested in these vehicles

Easy... At 65mph with the 6 speed ZF you are only running about that...

That is why even the V8 cars get great mileage....

Plenty of HP to get to 65 with ease, then it just barely idles to maintain highway speed....

65? Oh, yeah I see that go past if I glance down at the right time

That looks like a report from Blackstone labs. Although I am skeptical of putting faith in the results of individual reports, it is an encouraging set of data points.