I will listen more closely for it but so far the only thing I can hear when it's cold is the air pump.

Does anyone have a reccomendation for plugs and oil for these? I am getting ready to do a tune up and I am also wondering if there is anything else that requires frequent replacement during a tune up.

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• 1993 Mercedes-Benz 400E *146,000 Miles*
• 1985 Mercedes-Benz 300SD Turbo Diesel Biodiesel *SOLD @ 346,000 Miles*
• 1984 Mercedes-Benz 300D Turbo Diesel Biodiesel *SOLD @ 284,000 Miles*