The discussion went to bullying very fast when the poor east Europeans told the rich westerners that long OCIs are not justified and harmful.
Another example.
Renault Bulgaria refuses to change the oil of a brand new Megane 1.33tce before 30k km. My colleague combined a trip to Turkey with visit to Renault Odrin-Turkey to make an oil change at 10k km. Where they told him that he did the right thing.
RN-19 standard is LL oil and 1.33 tce is eligible for LL OCIs. Still the dealer in the country that manufactures it explains with numerous examples that it should be replaced at least three times more often.
Yesterday the most popular automotive host made numerous examples with BMW F10 engines having hard time going past 120-150k km with extended intervals and he interviewed reputable engine builder who explained what goes wrong in each engine. What's curious is that rod and main bearings also suffer the same as the timing components. Main reason: extended OCIs
The discussion went this way because the rich westerners are actually very cheap people...
I can give an example on the point of long OCIs not working well financially in the end:
As I mentioned previously, I change the synthetic oil on both my heavy duty trucks between 10-12 thousand miles. Most truckers that own their trucks don't do that, they go 20-30 thousand miles and company owned trucks go even further.
As a result, the Cummins ISX is "known" for oil pump failures around 400k and injector failures even earlier.
My pre emissions ISX has 1.1 million miles and it is still going strong without an overhaul, without oil pump or injector failures.
I like to think this is directly attributed to the short OCI and the light loads I do ( car hauler ).
My other truck, with the Cummins N14, has 1.4 million miles with no overhaul and it's still going strong - again, short OCIs and light loads.
The calculations are simple:
Short OCI, long engine life, money actually saved at the end.
So, it should not matter how good an oil is said to be (oxidation or soot suspension wise) it is always better to not go very long OCIs, it just does not make logical
The site had became outlandishly anti car guy.
BTW, similar very substantiated posts filled with knowledgeable pathos costed me a full set of valvetrain except the cams of then new Mustang GT. The anty SAE-20 campaign from 2005-onwards.
->So, oil at 6-7-8-10k miles is better than new oil? Yes, or no? What do you achieve with extended drain intervals?
Do you deny the loss of efficiency as oil ages?
My 1hd-fte was also spotless seemingly washed with detergent on the inside when we opened it for valve adjustment at 130k miles. Oils replaced randomly between as low as 600 mi, 3k mi and mostly 4-5k mi.
It seems that for most users here real life experience does not matter, it's just an assumption and that is " the mother of all screw ups" and whatever Toyota says is good apparently is the word of GOD himself...
And even for the poor Macedonian guy edywv, that believes in the history written for them by the serbians, it is more important to read the oil university on the front page instead of taking in mind real life experience.
Somehow, both my heavy duty engines are well over the million mile mark, but this is probably not because I've done frequent oil changes, it's just an assumption and this must be the mother of all screw ups...
Just go read the oil university and don't give them any real life experience, no point!
Because whatever the oil or car manufacturers says is THE word and it can be the ONLY truth, nothing else matters!
What a bunch of ignorant crowd this forum is!
Just wish em good luck and don't waste your time and knowledge here.