My first question is Diesel related:

Why does a Diesel engine not produce any manifold vacuum and therefore require a vacuum pump, while a gas engine creates its own vacuum?

My next question is Mercedes specific.

What's the logic behind the two settings on the light switch that turn on left or right side signal lights?


Going by past experience in reading posts here, I'll bet that Longston will have the most thorough answer to both of these questions. Thanks.

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Dave
1995 C280
1999 Triumph Daytona 955I - my speed fix.
1982 300TD - Gone, but not forgotten.