I noticed yesterday my 1987 260E is making a "whaaaa" sound during acceleration. The sound is similar to middle C on a piano and increases in volume with speed, but then it goes away once the car is at a steady speed. I revved the engine in the parking lot and I was not able to reproduce the sound. It has 213K on the engine/transmission, but still runs very well and sounds acceptable. The sound seems to be coming from the passenger side of the car. Is this likely to be wheel bearings?

New parts:

• Front inner/outer tie rods on left and right sides
• Front struts
• Strut bump stops and boots
• Strut mounts
• Front sway bar bushings
• Rear shocks
• Shock bump stops and boots
• Rear LCAs

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1987 Mercedes 260E (W124) 213,000 miles
1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold)