Fuel: Reg vs Prem

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FRED182
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Mercedes E320 cabriolet, 1995, 55,000 mi. The owners manual calls for premium fuel. What is the effect of running regular fuel instead?
Mar 30, 2006 at 9:18 AM
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LOSONE
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  • 1,616 POSTS
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The compression is too high to support regular fuel. Low octane will cause pre-denotation (pinging) and damage the cylinder head/valves. It is aluminum. Don't add octane boosters they are worth a rats behind!

Good luck!
Mar 30, 2006 at 9:53 AM
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BENZ_GUY
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In addition, be prepared for a Check Engine Light to illuminate, as the pinging will drive the knock sensors crazy to the point of triggering the CEL.
Apr 4, 2006 at 11:22 PM
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