It is simply planned obsolescence ...Flytox wrote:But on "cheap" vehicles, manufacturers seek more to optimize their costs and certain known more reliable and more expensive solutions are not retained.
For example, rocker arm covers or intake manifolds can be made of plastic instead of aluminum. It's lighter, much cheaper for the manufacturer ...... but after x years of use in hot oil and or under an overheated hood, the aluminum has not moved but the plastic can deform, allow oil to escape or allow air to enter which disturbs the carburation. In both cases, we can end up with a breakage "for stupidity".
When I recovered my minivan at 210.000 km at the weight of the scrap, I made a big overhaul, including the half shell of the plastic calorstat which was deformed and oozed ...
Despite all my care this engine remains a fryer that oozes oil everywhere ... Nothing to do with the quality of my old VOLVO or a Japanese woman who does not lose a drop of oil before 200.000km ...