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Fuel: Reg vs Prem

Tiny
FRED182
  • MEMBER
  • MERCEDES BENZ
Mercedes E320 cabriolet, 1995, 55,000 mi. The owners manual calls for premium fuel. What is the effect of running regular fuel instead?
Thursday, March 30th, 2006 AT 9:18 AM

2 Replies

Tiny
LOSONE
  • MECHANIC
  • 1,616 POSTS
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!
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Thursday, March 30th, 2006 AT 9:53 AM
Tiny
BENZ_GUY
  • MEMBER
  • 28 POSTS
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.
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Tuesday, April 4th, 2006 AT 11:22 PM

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