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mikkhh

Some manufacturers even push 150 000 km oil changes, BUT their main new truck buying customers are big fleets who want to see the best fuel economy and lowest downtime and cheapest maintenance on paper, BUT those big fleets keep trucks up to 3-4 years or up to 400 000 - 500 000km. It seems cheaper for them, but next buyer is going to have a trashed truck that requires major overhaul. Manufacturer is also happy since they can sell engines or parts, service schedules are calculated in a way that trucks or whatever equipment would just get past warranty stage and fail catastrophically after that.

https://www.scania.com/content/dam/scani...2206EN.pdf
Those fancy press releases and super duper long long long long life oil change intervals are made to appeal to those who have zero clue about equipment, but are choosing what brand of trucks or equipment to buy.

If any used and abused emissions truck has oil consumption issues, that are mostly due to long long long long life extended oil change intervals, then aftertreatment issues are guaranteed. But big fleets do not care, since it is not their problem anymore.

Expensive synthetic oil is not required on most engines, since mineral oil lubricates well enough. Pressure lubricated parts never fail on a properly maintained engine, something else fails first - liners dropping, cracked heads, seized connecting rod bushing. Now somebody could argue about that, since lots of modern cars get spun bearings, but it is not due to oil, most of modern cars have never ever seen egr and intake manifold cleaning, most of them have omitted cranskhaft counterweights, have way too much low end torque from factory and are prone to warping crankshafts and that is why bearings get spun. I have taken apart quite a few car engines that are notorious for bearing issues, first thing I do is look for crankshaft runout by inspecting main bearing wear and then look with dial indicator. The main killer is soot and wear materials in oil, synthetic does not cure them... Only way to lower wear particle buildup in oil is to change oil more frequently.