And change the air filter every 30,000 miles, or every 15,000 miles if you drive in severe conditions like stop and go traffic, frequent short trips, long periods of idling, drive at high speeds in hot weather for an extended period of time, driving more than 2,000 miles a month, etc...
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.