Are you sure it was smoke? My 300TE will sometimes admit steam as a result of A/C condensation dripping onto the drivetrain and exhaust. I'm not familiar with the 500E layout, but it might be similar. The condensation may have puddled somewhere while cruising, then when you came to a stop shifted forward and dropped a bunch of water at once. Might be a stupid idea, but just a thought....... Klaus
'07 R320 CDI " Manta Ray"
'62 300d Adenauer-350 Chevy
'12 VW Passat TDI 6/speed
'03 Dodge Ram 3500 - "Clifford, the big red Dodge" - Cummins w/6-speed
'68 Mustang fastback