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Also remember that the older the engine the more build-up in the combustion chamber and the higher the resulting compression.
The 190e with 220k miles doesn't like regular, will barely tolerate 89 octane if it is high quality and generally just prefers 91, which is the highest we can get around N. California.
Haasman
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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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