Just found the forum and saw all the talk about the Premium Octane.
Like the title stated, I have a '77 450 SEL V8 that I just purchased with 86K original miles and I am wondering about the recommended octane level, so that I can protect the engine properly.
The label on the dash just states "UNLEADED GASOLINE ONLY".

Am I safe with the 87 Octane?

Let me know please.

Boyd

You are fine with 87 octane. MB didn't start sepcifying high octane until I think 1986 .If she pings, go up to 89. Still pings, then put in the "high test" gas.
BTW my 911 calls for 87 as well. I can certainly run it on higher octane, but it will run without issues on 87.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member

Thanks for the reply.

Boyd