Which one puts engine under more pressure? High load lower RPM or low load higher RPM?


Karabiner98k

Kraftkurve King
Hello to everyone.

I live in an area in which there is a relatively steep uphill. I have to pass it every time I want to drive my car. I have tested my car in that road and the results are as following:

1 - If I drive with 3rd gear, I need to stay @ 4500 RPM to travel at the speed of 80 km/h. I press throttle about 30% to keep a steady speed. If I press the gas pedal more, the car will increase speed.

2 - I also tried using 4th gear. With 4th I have to apply around 60% throttle and keep engine speed @ 3500 RPM to travel at 80 km/h. If I press the gas more than 60%, it accelerates and speed will rise.

I didn't try 5th gear because I thought it will be considered engine lugging.

Now my question is that which driving scenario is worse for my engine? I prefer to drive up that hill with 4th. Is it harmful for the engine to keep running with 60% throttle for about 15 minutes in 4th gear?

(1.8L petrol engine with 5 speed manual transmission)
 

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