Primarily market pressure. Manufacturers want to build their products as cheaply as possible, this is only counterbalanced by consumers buying another brand because this one is a piece of shit due to how cheap it was made. Buyers of trucks with diesel engines are primarily businesses who will also calculate maintainence and repair costs as well as longevity in their purchasing decision. Buyers of cars with gas engines are mostly upper middle class people, who will turn around and trade this car in in a couple years for another brand new one, with very little thought given to how long it lasts overall. Also keep in mind that manufacturers don’t give a half a rat’s ass about people who buy their cars used, a car manufacturer makes no money on that transaction, as they’re not involved.
What this boils down to is they can cut more corners and make the gas engine less long lived because their buyers don’t care, they mostly have sold the car to somebody else by the time the warranty is up anyway.
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