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1. Boost leak / charge air leak An improperly secured clamp or misaligned hose after the filter box. Fractured intercooler tubing (prevalent in M47/E60 models). Damaged intercooler. This would also explain the exhaust odor—if the leak is close to the engine compartment, heated boost/exhaust vapors m...

Regrettably, affirmative.

Based on my expertise, your issue is likely associated with the slip rings and the corresponding finger blades that operate on them. They are situated at the rear of the wiper motor. In 1994, the plate should be unscrewed instead of being riveted.

That is astonishing!

The raise pump in the tank may be malfunctioning.

Your suggested modifications cannot invalidate the warranty unless it is shown that they are directly responsible for the failure; so, the grill may be a point of contention. If any of the cruise sensors and cameras malfunction, which may be affixed to the grille and were relocated to the new unit, ...

...and review the fine print...often, customer dissatisfaction arises from their failure to comprehend what is included and excluded prior to enrollment.

I went ahead with a C250 a beauty, through Carwin last year paid via bank transfer into their segregated account and had the car delivered to Glasgow a week later it turned up in better condition than the pictures suggested.

It would have had one at the time of the converter modification. The fluid level may be inaccurate if it was performed by untrained individuals, I presume.

The typical culprits are a sticky turbo actuator and a malfunctioning exhaust back pressure sensor; do not presume it is a gearbox problem. A session on STAR or Xentry should provide insights; even a self-scan with iCarsoft would be beneficial. Have you received the email yet? When it begins to jerk...