Thread: Looking for proof....

Originally Posted by TonyC

You would be better off doing oil analysis and changing the oil based on that info.

Tony

As i have said before,i had this done a few years ago using oil from the D2.It did 15k easy,and at 20k needed a change.

In those days i used Castrol to do the analysis,as we were very good customers of them,using synthetic refrigeration oils.

In fact the comment was the oil from the D2(fully synthetic) was in better condition at 15K than a Nissan Patrol diesel(4.2)(mineral) at 3K.

This was a good few years ago(TD5),so things would have improved with the latest engines,and oils, that are around today.

Originally Posted by PhilipA

Well my proof of longevity is a Mazda 121 that I bought 15 years ago with about 70KK on it, and I changed oil every 5KK until 7 years ago [snip]

My RRC also got changes every 5 KK, and I owned it 13 years with a lot of towing. When I last checked compression at 220Kk plus it was 150 PSI on all cylinders and oil usage of about 1L per 5KK, which was the same as when I bought it with 76KK on it.
[snip]s.
Regards Philip A

And now for the flip side.

Our Patrol has now clocked 430,000km.

After the 100,000km warranty was up (in just over two years) I went from the recommended 5,000km OCI's (oil change intervals) to 20,000km with a premium, full synthetic HD diesel oil.

I know, I've posted this more times than we can poke a stick at but yes, 20,000km OCI's in an indirect injected diesel back when we still had 500PPM sulphur fuel.
At the time the car was towing horses almost every day and continued towing duty for the next five years.

430,000km, nothing done to the engine. Still has original injectors (I'm slack) Last OCI was 20,000km purely as SWMBO has been on the go for the last three months, many family crisis/tragedies and lots of km. She took the train thsi weekend so I could actually service the damned thing.
I had to add 1.5l of oil over the OCI. Valve stem seals appear to be leaking a little.
I've stuck to 10,000km for the last five years.
I also did regular oil testing for that time and the oil always looked fantastic and had plenty of life left when I dumped it at that distance, but we were in front financially so out it went.

Fuel economy and performance are still as original.

Premium oils, premium filtration and no short trips means longer service intervals are easy.

Originally Posted by rick130

And now for the flip side.

Our Patrol has now clocked 430,000km.

After the 100,000km warranty was up (in just over two years) I went from the recommended 5,000km OCI's (oil change intervals) to 20,000km with a premium, full synthetic HD diesel oil.

I know, I've posted this more times than we can poke a stick at but yes, 20,000km OCI's in an indirect injected diesel back when we still had 500PPM sulphur fuel.
At the time the car was towing horses almost every day and continued towing duty for the next five years.

430,000km, nothing done to the engine. Still has original injectors (I'm slack) Last OCI was 20,000km purely as SWMBO has been on the go for the last three months, many family crisis/tragedies and lots of km. She took the train thsi weekend so I could actually service the damned thing.
I had to add 1.5l of oil over the OCI. Valve stem seals appear to be leaking a little.
I've stuck to 10,000km for the last five years.
I also did regular oil testing for that time and the oil always looked fantastic and had plenty of life left when I dumped it at that distance, but we were in front financially so out it went.

Fuel economy and performance are still as original.

Premium oils, premium filtration and no short trips means longer service intervals are easy.

first things first, 32-1 is better than 50-1 and thats a fact jack! Secondly, what about engine design, mass and output?

BTW, were the 5100s sold here in oz, either dolmar or makita?

Originally Posted by uninformed

first things first, 32-1 is better than 50-1 and thats a fact jack! Secondly, what about engine design, mass and output?

Absolutely !

You know I'd never argue on that point

Actually sump capacity has a great deal of bearing (no pun intended) on oil life too.
The more oil an engine physically carries in its sump, the better it can cope with oxidatitive stress/soot loading (in a diesel) and additive depletion.

BTW, were the 5100s sold here in oz, either dolmar or makita?

No.

Just sending an order through to Kyle for some spares, I can ask how much a 5105 is ?
Matt still says he regrets selling his 5100 even though he has a new 550XP and reckons he'll eventually try and buy it back.

I 'tailor' OCI's to individual needs, mostly we do 10,000km /6 months on everything.

I will seldom do 5000km unless 12 months elapses without reaching the KM, and seldom do 20,000km (In tasmania) unless lots of open highway driving. Had a D2 Td5 in here last week that does quite a bit of mainland 'commuting' and has 255K up on a 2004 model. His changes have been 20K interval and engine internals look great when changing out rocker cover gasket.

JC

I have to add the one thing a long service interval can't account for/cope with and that is fuel dilution.

In modern engines in particular, both diesel and direct injection petrol can have major problems with this and nothing, absolutely nothing can counter it other than replacing the oil. (and fixing the problem)
It doesn't matter how exxy or fancy a name an oil carries none can cope with fuel dilution.

IME... for normal driving with 10% off road (low range type stuff), 20% urban crawl (school zones and <50 through round abouts dense population ares)50% at average speeds (60-80), 30% sustained cruise (90-110ish)

the tdi likes a 10 k change but makes it to 15K
the td5 likes a 15k change but makes it to 20
the early v8 likes a 7.5k but makes 10k
the later v8s like a 10K change but may make up too 15K (Ive not had many clients with later v8s that skimp oil changes so dont have a reliable maintenance log for that)

But thats a full oil and filter change NOT an oil only of filter only change program that some manufactures who have a short oil change reccomendation

Will a greater percentage of highway speed cruising (100-120km ) "shorten" or "extend" oil life?
I drive a km of no speed limit road than smack onto the highway for the vast majority of my driving, the rest (20%) wouldn't be under 50 unless I'm going offroad. So 80% sustained cruising, 10% average speeds, 10% offroad.