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2001 CLK430
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107 Posts
Discussion Starter #1
I have been considering the purchase of an early 70's 350 or 450 SL and was wonderig if those earlier cars required leaded gas for the valve seats. Also what are the octane requirements? What sort of fuel mileage can be expected from such a car?

TIA

Neil
 

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fuel

If you go to the archives at www.mercedes.cx/archives/ you will find quite alot of info on the leaded gas vs unleaded. The conventional wisdom seems to be that for most Mercs unleaded is ok as long as you go for the premium ones with the higher octane rating.

I have a 450 slc [ which is a bit heavier] and I think i run around town at about 14/15 mpg.
 

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2001 CLK430
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107 Posts
Discussion Starter #3
Thanks. That pretty much answers my question....

Thanks. That pretty much answers my question.
 

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1976 MB 450 SL
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9 Posts
fuel

I have a 1976 450 SL with 210k miles. I use 93 unleaded. I get 12 mpg both on road and city. I get 10 mpg using AC. I think this is quite good actually. My mechanic recommends that only high octane be used for the older cars. He also recommends the use of Marvel Mystery oil in the fuel system to lubricate the seals. I use it about once a month. Car runs very good for the mileage on it.
 
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