Extended oil change intervals impact on Wear

[Roberts9156]

Please help me understand. I’ve heard multiple times that a lot wear is from <15 micron particle size, which is mostly not caught by oil filters. Yet it seems like many people are confident in going extended oil change intervals just knowing the oil stays in grade and fuel dilution.

Does the wear rate not accelerate the longer oil is run, and why?

 

[GW.]

IMO the longer the oil change interval the more important filtration is. A higher efficiency filter will catch more of the smaller particles. That said I don’t do extended oil change intervals and still use high efficiency filters.

 

[bigjohn]

I'm just not doing long oil change intervals any more..... My Diesels, which are 10k... I am now changing at 7,500. My gassers that are 7-8k OCI's... I am changing at 5k.

Why???? I had a turbo failure at 9,500 on the oil change interval and my mechanic believes it was a lube issue. That was $8,000. I don't give a rip what anyone's opinions are on this matter.... I am reducing my oil change intervals.

For what it is worth, I have always run top shelf oil and expensive filters.

I have a brand new Jeep Wrangler Rubicon with the 2.0L Turbo and it will be changed every 5k miles.

 

[Japanese]

Please help me understand. I’ve heard multiple times that a lot wear is from <15 micron particle size, which is mostly not caught by oil filters. Yet it seems like many people are confident in going extended oil change intervals just knowing the oil stays in grade and fuel dilution.

Does the wear rate not accelerate the longer oil is run, and why?

The oil life is monitored usually by its:
Viscosity
TBN
Flash point
Accumulation of metal from the engine in it
Amount of its detergent and dispersants
Amount of water and/or coolant in it

However, you never know how the oil lubricates (does it do its job or not) even some of those are in specs on the used oil analysis.

 

[SC Maintenance]

There are lots of industrial machine studies showing it happens there. One could argue it doesn’t apply to a car ?

Most people don’t get past 200K miles anyway. A good engine will make that likely with whatever OCI and a poor one will likely blow up due to something else. So the reality is it’s seldom put to any test anyway.

I do 5000 OCI and run my cars much longer than most.