Date registered: Aug 2005
Vehicle: 2005 and 2006 C230s
Location: North Bend, WA
Mentioned: 0 Post(s)
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RE: Media saying Premium Gas is Uneccesary?
Here's a big secret:
In a majority of cars, premium fuel is not required.
The problem with that statement is that the devil is in the details. Premium fuel allows an engine to resist knocking (pre-ignition of the fuel before the spark plug ignites it near Top Dead Center (TDC)), and therefore have advanced (quicker/closer to TDC) timing. In that, it creates more power by lighting off a more compressed fuel/air mixture... More compression = bigger explosion = more power. You can put in crappy gas, and your cars ECU will retard (push back) the timing and resist knocking on it's own. It will also make less power, get worse fuel mileage, and in some high compression cases, the engine can not fully resist knocking, and it still occurs. This puts a tremendous ammount of stress on the connecting rods, and wrist pins in your engine.
Do you NEED premium... No, and in cases where you can not get premium, you can put in regular, and be easy on the engine (shifting early and being a little easier on the throttle) until you can get 91+ octane into the car. For the life of your car, it isn't a great idea. In many cases, the drop in fuel mileage offsets the cost fo just puting in higher octane fuel anyways.