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  #1  
Old 04-28-2005, 10:26 AM
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Join Date: Jul 2004
Location: michigan
Posts: 4
mid-grade fuel

Reduced costs??

I have a friend who burns mid grade unleaded in his 96 S320.
He says there is no reduced performance or pinging.
Would this be a good for my 95 S420?
I know the manual say premium.
Thanks for input.
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  #2  
Old 04-28-2005, 10:54 AM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,621
I am having no trouble with mid-grade in south carolina. I am told we have "good gas" here.....

I have also been told that when it gets warmer, I will likely have to switch back to premium.... I actually noticed a slight increase in gas mileage...about 1/2 mpg...
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1994 e320 Cabriolet 98k (finally)



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Old 04-28-2005, 11:40 AM
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Join Date: Feb 2005
Posts: 177
Use whatever fuel grade/octane that does not cause your engine to PING under a load. In my 1995 SL320 with a M104 engine I have been using 87 octane with no problems for 6 years. In my 86 M103 engine it will only take 91 octane , so go figure
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2004 SL500 Black 55K Miles
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  #4  
Old 04-28-2005, 11:45 AM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,095
Your '95 has a knock sensor that will retard the timing and keep the engine out of detonation. Your '86 does not.

I use 87 PON durilng the winter and have no detonation, but as temperatures warm up, there is some transient detonation, especially if I short shift and get on the throttle quickly. I think it's just a lag in the vacuum advance pulling back, but I can "drive around" the problem by shifting at higher revs or feeding the throttle in at a slower rate.

Duke
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  #5  
Old 04-28-2005, 12:22 PM
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Bryson City NC
 
Join Date: Mar 2005
Posts: 182
I have been running Reg 87 Oct since I got the car a yr ago! It is the 4.2 V8! The day I bought the car I filled with Reg and I had to drive it back home and climb a Mtn. pass! The car never pinged or felt down on power. I do put in a can of SeaFoam in the tank once a mo. to clean up the sys. After a yr. still runs smooth as silk!


Smokie
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