Answers: In the same sports car, the larger, more powerful 6-cylinder engine will probably last longer, as it doesn't own to work as hard to maintain the car moving down the road.
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I would articulate It's up to you and how well you protract the engine. Alot of variables come into play as well. Such as what brand of vehicle it is in. Power to weightiness ratio will be important, is it a diesel? Is it a turbo ? Is it carbureted or FI, but most how powerfully it is maintained. But I would put the smart money on the six, more power for the bulk, (less work) but your fuel mileage will suffer.
In theory, the larger engine should concluding longer but it depends on how hard you drive it. You might drive a 4-cyl more sympathetically than a V-6. An inline 6-cyl will generally outlast a V-6 due to the route the whole cooling process works.
V-6's and inline 4-cyl appear to be more prone to head warpage and lead gasket problems but only if the engine is surrounded by a car specifically too heavy. (HP to curb shipment balance is style off.)
I resembling to think of it approaching this; one cylinder per wheel and two cylinders to drive the paraphernalia, minimum. Cars with A/C specifically run a lot will put more strain on a motor. The A/C compressor engage in Winter when you use the defroster, too.
Many factor to consider but a well maintain engine that is not constantly pushed to the brim of its performance potential will last a severely long time. Servicing the cooling system is as important as servicing the grease and letting things go until you hit 100,000 miles or 160,000 kilometers is no path to maintain a sports car but this is what the owners manuals will enjoy you believe in some newer models. They still may be running but of course not as well as "resembling new".
Good Luck!
The 6 will generally outlast the 4. 6 cylinder engines are usually larger displacement (CC's, liters, or cubic inches), and operate at lower revolutions per minute than 4s because they produce more power contained by every revolution. Therefore every part within the engine is moving and wearing out more slowly. However if they are of comparable displacement, this may not apply.
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