Originally Posted By: bbhero
One of a number of tidbits of good information I've learned on here is that there are a good amount of applications where long OCI are just fine.
I do believe there are some circumstances where a shorter interval may be more advisable for some too. I have learned that the motor in my car is rather harsh on oil from the Nissan and Infinity site. Add to that my driving area is 50\50 highway to city is another factor plus short trips has well.
But that is just my own situation. Easily can be very different for someone else driving all highway and different motor. In NASCAR I have heard they change the oil in their cars after practice and qualifying. Fresh oil is in the car for the race. Now even in NASCAR there are variances with race conditions at different tracks. For example at Michigan, Atlanta or Autoclub speedway the motors are under high hanging RPMs that take a toll on motors. Whereas at Bristol, Richmond and Martinsville the motors run from 4k RPM to 9k RPMs. These are very different conditions in which these motors have to endure.
I do believe these new pepped up 4 cylinders running higher RPMs even traveling 70 mph plus could be a difference maker too. A motor turning 3500 plus RPM versus my car that turns 2300 RPM at 75 mph cruising speed is a big difference. How much more would that motor revolutions would it turn in just a 500 mile open highway trip than my car? It becomes exponential rather quickly. If I owned a peppy 4 cylinder car I would not want to push real far with a interval.
But again, there are MANY applications where going up to 15k miles would be just fine. Heck the one fella on here with 349,000 plus miles doing longer intervals is a great case in point
It can be done. No doubt. I do feel like its perfectly fine for many to do just that. For me I will adjust mine according to my own circumstance.
I couldn't agree more. Each duty cycle is different and one size doesn't fit all.
I only take issue with absurdity.
The previous post I quoted is a perfect example of absurd. It's complete with half truths,wives tale and the guy believes it,which is sad.
It shows that he didn't do his homework before posting. It's been implied here via used oil analysis that wear metals shedding actually decreases as the miles rack up,and most wear happens at the beginning of the interval when the new oil hasn't oxidized enough to provide maximum protection,and the new oil hasn't laid down its tribo-chemical layer yet.
So more frequent oil changes actually increase wear metal shedding because of the stripping and re-applying of the tribo-chemical film.
Not that I give a single used oil analysis any real clout. Most here are aware that wear cannot be accurately measured via a used oil analysis and understand that data is required,lots of it before any real conclusions can be drawn.
These guys who take one oil,do a used oil analysis then use a different oil and another used oil analysis then compare wear metals and conclude the sample with the lowest wear metals is better are foolish and don't understand in the least how to interpret the data they've paid for. It's laughable.
If I'm ever in doubt I go to Doug Hillary's profile and search for an answer. The guy is an actual expert whose happy to share his knowledge. He's the real deal and we are lucky to have him.
Anyways extended intervals are easily do-able. To believe otherwise is denying the obvious and proves absolute ignorance.
But some people don't let facts get in the way of their opinions,why would BITOG be any different.