BenzWorld Senior Member
Date registered: Jun 2010
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I for one have your car ( 67 250se w108) I have run premium unleaded for the past 3 years. Runs just the same now as then. I have heard both also some people say run an additive to be safe, But I have also heard some competent mechanics also say it is not needed.
Oh yeah your engine air filter should be dry. I'd replace it with a fresh new one, wipe down the whole area, then try to see where the oil or whatever it is is coming from.