Re: Give me your opinion please.
Well it took 9 months but the dealer is replacing the intercooler under the service contract! They found water and coolant stains in the intercooler when it was removed for inspection.
It appears that the best identifiers for an intercooler leak are O2 sensor failure and minor loss of coolent with no external leak. As stated by other members: The standard dealer pressure checks, dye checks and exhaust gas coolant mix test do not prove anything when it comes to an intercooler leak.
Dealership says the replacement intercooler is on back-order. Appearently there is somewhat of a demmand on intercoolers for this engine. The estimate is 1 week to get the car back.