Chrysler 300C
5.7L Hemi V8, cast iron block, pushrod two-valve — 375 hp and that unmistakable idle burble. MDS deactivates cylinders 1, 4, 6, 7 under light throttle — deactivated lifters run dry on cam lobes, metal debris destroys the camshaft. Class action: Petro v. FCA. Manual cars skip MDS entirely — no deactivation hardware, no lifter lottery. That is THE buying tip. Software delete via DiabloSport/HP Tuners: $400-650, prevents activation but lifters stay, voids warranty, costs 2-4 MPG. On 0W-40 at 5,000 mile intervals, the bottom end is solid.
Wide, heavy, with real V8 character
The first 300C with the Hemi was a sensation in the US. Gangster looks, RWD, 340 hp at an entry price that embarrassed the competition. MDS in the automatic 300C is the risk.
Engine Weaknesses 4
MDS deactivates 4 cylinders under light load. Deactivated lifter rollers run dry, metal debris destroys camshaft. Class action: Petro v. FCA (1:22-cv-00621). Engine replacement ~$5,000. Manual cars have NO MDS — this failure doesn't apply to stick-shift Challengers.
Symptoms: Loud ticking progressing to knocking, misfires, check engine light, metal shavings in oil
Plastic impeller separates or bearing wears. Weep hole dripping coolant is the early warning. Bearing failure causes pulley wobble.
Symptoms: Coolant puddle under front, squealing noise, overheating, pulley wobble
Metallic ticking from valvetrain on cold start. Can be harmless exhaust manifold leak or dangerous MDS lifter damage. Tick that persists past warmup is a red flag for lifter failure.
Symptoms: Ticking on cold start, may disappear after warmup (exhaust) or persist and worsen (lifter)
Steel bolts on aluminum heads — different thermal expansion snaps bolts after heat cycles. Ticking on cold start that disappears when metal expands is the classic symptom.
Symptoms: Metallic ticking on cold start, disappears after warmup, exhaust smell in cabin
Vehicle Weaknesses 5
Hydraulic power steering pump leaks through worn seals, hoses, or fittings. Low fluid makes steering heavy and damages the pump further. Pump replacement $300-1,200.
O-rings at the engine oil cooler harden and flatten — oil or coolant leaks around the cooler area. Can lead to oil contamination in coolant or vice versa when cooling and oil circuits are combined.
Window regulator cable snaps, window no longer functions. Very frequently reported, all doors affected. Replacement $320-715.
Interior door handle breaks at the frequently-cycled connection point. Plastic at handle-to-cable linkage fails over time. Replacement affordable ($72-80 parts), shop cost approx. $50-130.
Small gears in the blend door actuator strip out, causing persistent clicking noise from the dashboard. Repair requires full dashboard removal — very labor intensive.
