I was told by the dealer that the 2003 CTS has plastic valve covers and they warp. To cure the leak you need to replace the valve cover.
JCH
Check front crankshaft seal from under car, see if you see oil coming out of back of pulley.
SOURCE: How to clean out clogged sunroof drains?
Get some flexible (not solid core) single core electrical cable of a slightly smaller diameter to the drain hole and ease it into the drain hole. Don't force it just gently ease it in. If that doesn't work you can sometimes use an airline to blow it out.
SOURCE: need firing sequence on the V6 3.2L
3.2L Engine
Firing Order: 1-6-5-4-3-2
If you need a diagram, let me know.
SOURCE: 2003 cadillac cts v6 3.2 liter. white smoke
u have a leak in the heater core the oily smell and mist is anti freeze sounds like a small leak because usually u would have a wet floor if it was large -two choices check and repair as necessary the core or can use an additive with a stop leak they usually work well on small leaks
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