Premium Grade
Premium Grade
Regular, Mid-grade or Premium fuel for VW Jetta VR6?
I have a 2001 Volkswagen Jetta. It has a 6 cylinder engine. When I open the fuel door, it says to use Premium fuel. The Volkswagen service technician told me to use Regular fuel in the winter and Mid-Grade in the summer and to stop using Premium. Is the Volkswagen service tech wrong? If I should use Regular, why does my car say to use Premium? Am I going to damage anything by using Regular?
the middle octane changes the least because there is no middle octane, it just pumps half and half from the high and low, thats why its ALWAYS a dead center octane rating, not to mention not having to have a 3rd tank to fill at the station....
As for octane - it has less to do with economy, and more to do with your engine....
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
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