the only reason I take oil samples on my own diesel these days is to check for coolant leaching into my sump oil, I don't worry if my oil needs changing anymore, because if my oil needs changing I have to repair my engine.

It really is that simple now that I started with a new engine a few years back...

 

I'm sure they changed it in the first 100,000,,,,I meant he never changed it in the last 200,000.

 

In the eight months since switching oil brands, installing off-line filters and ramping-up its oil analysis program, Schmid has noticed that lubricant and maintenance costs have gone down. In particular, new oil and filter purchases and disposal costs have been significantly reduced.

When this program started, everyone wondered if it would be cost-effective. “Our mechanics said ‘we sample every 250 hours and 10,000 miles on the engines and never seem to see a big change,’” Winberg said


The day it all began to fall into perspective was when high levels of potassium and positive glycol were reported on a scraper engine oil sample. Taking the lab’s advice, mechanics resampled the engine at 100 hours with the same results (Figure 3). The equipment was immediately shutdown and inspected to determine the root cause, which was found to be a blown head gasket. The repair bill for the head gasket was $400 and saved a $15,000 engine, all because of oil sampling

 

I do full synthetic and motorcraft filters, i've been changing every 6-7k miles, i feel pretty good with that and i'm sure i could go further and may try it in the future.

 

Imagine going the opposite direction, and the pros call it cheap insurance!

 

That's with fleets. The company I drive for has a couple hundred 10 wheel tractors and they do oil analysis and what you described above and I bet it pass off for them too.

I have 2 vehicles. When I did the Amsoil by-pass with EA filters and ASL oil with analysis I only had one vehicle which was a gasser; Now I just change twice a year which is about 6,000 to 7,500 mile intervals.

 

It is easier to change 2x a year than drive 2 years with no change?
You stated you used ASL and bypass filtration, this is a proven winner and I have gone way over 25,000 miles with AMSOIL with great UOA reports.

just wondering I had to reap your reply a few times...

 

Two years oil changes cost me about $160; that's 4 oil changes; 24,000 - 30,000 miles in two years.

its $194 for 2 changes in 2 years for just the ASL oil and 2 EA filters; not including the by pass filter or oil analysis or the initial cost to install the bypass system.

I couldn't go much more than 32,000 miles with bypass because of low TBN. I am a short trip, mostly city miles type driving.

Edit: Want to add that with out bypass and just ASL with EA oil filter and air filter I was around 12000 miles with low TBN and high viscosity, it was awhile ago but I think viscosity was near 40 weight or over, not sure though, cant remember.

 

Anyone have a series of UOA's on a 6.0 that shows the oil shearing? The biggest reasons I do 5k intervals in my truck is 1) changing from 5W40 to 10W30 or 0W40 in the winter, and 2) all the talk about viscosity getting hammered by the injectors.

$100 of T6 and a filter at 5k instead of 10k is a LOT cheaper than 8 injectors at $220 a pop, plus o-rings and misc parts to replace them. Obviously not a problem on the gassers or new common rail diesels.

 

Yes this one was our first sample with 10,000 or so miles
We left it in and sampled again at 22,000 miles, oil was still good to go.
I have to find that other sample sheet to share, meanwhile here is this one>>>

 

Full synthetic every 5k. Hoping its a value add....

 

blind trust in advertising and popularity, similar to sheep

 

Using full synthetic oil and changing it at 5000 miles won't gain you anything except a lighter wallet.

Sent from my HTC ONE using IB AutoGroup

 

A lil judgmental???

 

If you (or anyone else for that matter) wants to change the oil at 5000 miles, or really even 7500, you can go with a convetional oil unless you need low weight oil for the winter.

Changing synthetic at 5000 is like pouring money down the drain.