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The E46 series is very DIY. I had a 2006 325i and did all of the work on it. The window regulators go out with regularity, but you can get aftermarket ones for less than $50 and the install only takes an hour.
Hopefully at 98K miles someone has gone through the cooling system. It is recommended that you replace the belts, water pump, thermostat, hoses and expansion tank. Some replace the radiator. I did all but the radiator in my driveway on a Saturday in about 4 hours and cost around $600. The 6 cylinder engine is virtually indestructible. Some have had problems with the VANOS, but again, the fix is DIY. The manual transmission will last forever.
Oh and Bentley makes a very comprehensive manual for the E46 and there is great online support.
I don't know squat about MB's so can offer no opinion there.
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Kurt V
No more Porsches, but a revolving number of motorcycles.
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