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Old 10-13-2000, 12:18 AM
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Location: Arizona
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what is the lowest octane that can be used in the 420/430 class cars
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Old 10-13-2000, 12:27 AM
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Location: Lake Geneva, WI.
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103 oct.,,,,,,,,,,,,,, just kidding, trying to save on cash or what? mercedes engines are performance engines. i wouldn't use anything less than 89 oct.

87 300E

87 420SEL
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Old 10-13-2000, 06:37 AM
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Exactly what year and model car are you asking about?

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Old 10-13-2000, 12:42 PM
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420E 1995, Thanks.

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Old 10-13-2000, 01:14 PM
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Join Date: Nov 1999
Location: Santa Cruz, CA USA
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I don't know about the new MB's but my 1986 MB really likes high octaine. Like 92. I tried to save a couple of bucks by using the lower priced stuff, but I really noticed a difference in the mileage I was getting. 86 octaine gets me roughly 18.75 MPG, while the 92 gets me around 23.5 MPG. Sometimes more. Especially if I slightly overinflate the tires a pound or two. The difference in price I think is well made up for with an extra 75 miles per tank! (Depending of course on how I drive and how late I'm running) Since I spend an hour and a half per day commuting almost exclusively on the freeway, I have time to notice these things. I'm going to try for 25 MPG with the tank I have now. I've heard people argue that the brand of Gasoline makes a difference. I haven't found that to be true. The only thing effected by different gasoline brands is my pocket book!

Kyle De Priest
1986 300e
1972 BMW R75/5 (Best there is)
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