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Old 04-28-2005, 11:26 AM
Registered User
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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Old 04-28-2005, 11:54 AM
Registered User
Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,631
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...
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it

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Old 04-28-2005, 12:40 PM
Registered User
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

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles
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Old 04-28-2005, 12:45 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,151
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.

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Old 04-28-2005, 01:22 PM
Smokiesman's Avatar
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!


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