BUY WITH CARE

The defining Chrysler Pentastar 3.6 defect is left-bank cylinder-head failure on the early (2011-2013) engines: valve-seat erosion in one head produces a cold-start ticking that progresses to misfires -- P0300 plus cylinder-specific codes, most often cylinders 1, 2, 3 and 5 -- and can let combustion gases into the coolant. 193 federal ENGINE complaints across the 2011-2013 Grand Cherokee, Grand Caravan and Town & Country and the 2012-2013 Wrangler describe ticking, misfires, or a replaced head. Owners report Chrysler extended coverage to 10 years/150,000 miles on the LEFT head only; on 2011-2013 cars that term has now lapsed by calendar.

Check — Cold-start, listen for a top-end tick that fades as the engine warms; scan for stored or pending misfire codes and check for coolant loss with no external leak. Ask whether either cylinder head was replaced, and whether it was the left (warranty) or right (owner-paid) side. The 10yr/150k head extension is expired on 2011-2013 cars, so a future failure is out of pocket.