What is the highest RPM I should coast at on the highway?
joshua_phillips12 asked:
I have a 2006 1.8S sentra. I’m stationed in Germany and I consistanly drive for 30 min to 2 hours at 80 to 100 miles an hour on the autobaun. The highest i will coast at is about 4000 rpm and the redline is 6500. I only use Royal Purple oil and change it every 2000 to 2500 miles. Is this bad for my vehicle?
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the engine should be fine at those rpms. royal purple is the best synthetic on the market.
Comment by hittich516 — July 21, 2006 @ 4:01 am
highway 1
Judging by your attention to detail with the oil changes… I can’t think as to why this would damage your car while cruising. 4000RPM is right around the middle of the power band on that car, so it should be fine.
Comment by Porterhouse — July 21, 2006 @ 1:33 pm
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From what I hear you saying, you aren’t hurting a thing. Highway miles with the engine at full operating temperature is the best possible miles a vehicle can have on it. The way you are treating this car I wouldn’t be afraid to buy it at 150,000 miles. In fact I would rather have yours than the one the little old lady drove three blocks to the grocery store every day. A sustained RPM of 4000 is still WELL under red line and in top gear it will run like that for years nonstop.
Last thought. You say you are coasting, I assume you mean cruising. Simply maintaining the speed without trying to accelerate or decelerate. At 100 MPH cruise you are pulling power out of that engine. It is overcoming the drag of the car. That means the engine has a load on it. That is a good thing. A truly unloaded engine as in sitting in the driveway and running at 4000 RPM for hours is not a good thing.
You say you are stationed in Germany. Sounds like you’re in the military. If so thanks for putting the uniform on. I wore mine for 22 years.
Comment by gimpalomg — July 22, 2006 @ 2:09 pm
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If the engine was designed to run at that rpm for that speed then it’s quite ok
Comment by duce — July 22, 2006 @ 6:46 pm