My dealer emailed this to me:
Subject: 2006 Cadillac STS-V, XLR-V LC3 4.4L Supercharged V8 Engine Exchange
Message #: CAS20060088
TO: All Cadillac Dealers
SUBJECT: LC3 4.4L Supercharged V8 engine exchange
MODELS: 2006 Cadillac STS-V, XLR-V
ATTENTION: Service Manager, Parts Manager
The LC3 4.4L supercharged V8 engine is involved in an engine exchange program. Before servicing any LC3 engine components, please refer to service bulletin 05-06-01-033 for a list of serviceable components and other details of the engine exchange program. Thank you for your assistance
Subject: 2006 Cadillac STS-V, XLR-V LC3 4.4L Supercharged V8 Engine Exchange
Message #: CAS20060088
TO: All Cadillac Dealers
SUBJECT: LC3 4.4L Supercharged V8 engine exchange
MODELS: 2006 Cadillac STS-V, XLR-V
ATTENTION: Service Manager, Parts Manager
The LC3 4.4L supercharged V8 engine is involved in an engine exchange program. Before servicing any LC3 engine components, please refer to service bulletin 05-06-01-033 for a list of serviceable components and other details of the engine exchange program. Thank you for your assistance