I have two Volvos. I live in Denver and like to drive up the mountain roads on weekends during both summer and winter conditions. The 1987 Volvo 760 has a 4 cylinder gasoline turbocharged engine, does not require synthetic oil or premium fuel. I still have the original engine, automatic transmission, turbocharger with 196,000+ miles of use. Two fuel pumps; one inside the fuel tank.
The 1996 Volvo 850 5 cylinder, normally aspirated, gasoline engine with 5 speed manual transmission which produces about the same amount of horsepower as the 1987 760 4 cylinder turbo car. This 1996 car has 215,000+ miles of use. One fuel pump (inside the fuel tank).
The 4 cylinder turbo engine gets slightly less highway mpg; both get about the same city mpg. The turbo lag is a non-issue. Both engines have been trouble free.
The key to an engine’s long life–regularly scheduled maintenance!!