Maybe not related, but I have noticed a vibration from the engine at first start-up in the morning lasting about 5 seconds...then stops. I just noticed that my fan has a distinct wobble at idle. The car is a 1998 E300 turbo diesel, with 80K miles on it. Is this anything possibly due to the harmonic balancer?
RSL

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RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa