AlKraut said: Not sure if they have Sunoco gas stations in Seattle, but the east coast Sunoco pumps have 4 options: 87, 89, 91, 93. 91 works well in my 560SL.
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No Sunoco in Seattle or the Northwest for that matter....and no 93 octane gas.....unless you want to use a racing additive to boost the octane of the pump stuff you are out of luck.

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1986 560 SEL (159K miles)