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Old 01-15-2003, 02:26 PM
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G-Benz G-Benz is offline
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
I run premium because it's recommended by MB.

No fuel-related problems yet, but that may not have anything to do with octane quality.

If ever I do have a fuel-related issue, at least it's a parameter I can rule out.

Many on this forum used regular (81-85) and have had good results.

Higher octane fuels have a higher "flash point" i.e., needs higher temps in order to ignite. So there is less of an issue with problems such as "pre-ignition" or detonation.

But if you start hearing pinging under load conditions, then you do need to bump up the octane choice.
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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