2008 CHRYSLER 300 SRT8

Typical onset: 80,000-140,000 mi

Symptoms: Harsh 2-3 or 3-4 shifts, flaring on upshifts, Delayed engagement into Drive or Reverse, Transmission overheating warnings, limp mode, Whining or grinding from bellhousing area (bearing failure)

Fix: The Mercedes-derived 5-speed auto doesn't handle repeated high-torque launches well. Input/output shaft bearings fail first, then clutch packs. Requires full rebuild with updated bearings and clutches, or replacement with reman unit. 12-16 hours labor for R&R and rebuild. Cooler lines and external cooler should be replaced during the job.

Estimated cost: $3,200-5,500

Typical onset: 90,000-150,000 mi

Symptoms: Blue smoke puff on cold start after sitting overnight, Oil consumption 1 quart per 800-1,500 miles, Fouled spark plugs on cylinders 2, 4, 6, 8 (exhaust side), Rough idle until engine warms up

Fix: OEM valve seals harden and crack with age. Oil seeps down valve stems into combustion chambers overnight. Requires cylinder head removal, valve job, new seals, and typically new guides. Budget 18-22 hours labor for both heads. If caught early, prevents catalytic converter damage. Some shops quote heads-on seal replacement but quality suffers.

Estimated cost: $2,800-4,200

Typical onset: 120,000-180,000 mi

Symptoms: Rattling noise on cold start for 3-5 seconds, Engine rattle under acceleration between 2,000-3,500 RPM, Check engine light with cam/crank correlation codes P0016, P0017, Plastic shavings in oil filter media during changes

Fix: The 6.1 Hemi uses plastic-backed timing chain guides that wear and fragment. If a guide breaks, the chain slaps and can jump time, causing piston-to-valve contact. Preventive replacement of all guides, tensioners, and chains requires front-engine teardown. 14-18 hours labor. Water pump and front seals should be done simultaneously.

Estimated cost: $2,500-3,800

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid spots under front of vehicle, Low fluid level on dipstick, burnt smell, Delayed shifts, slipping after highway runs, Pink fluid dripping near radiator or along frame rail

Fix: Factory cooler lines corrode at crimp fittings and the auxiliary cooler develops pinhole leaks. These failures starve the transmission of fluid during towing or spirited driving. Replace all hard lines, rubber hoses, and external cooler as a system. 4-6 hours labor. Flush transmission and verify no internal damage occurred from low fluid.

Estimated cost: $800-1,400

Typical onset: 100,000+ mi

Symptoms: Coolant leak from rear of engine block, driver side, Coolant loss with no visible external leak (rear plugs), Steam or coolant smell from bellhousing area, Overheating if leak becomes severe

Fix: Rear freeze plugs corrode through on neglected cooling systems or where cars saw winter road salt. Rear-most plugs require transmission removal for access. Full set replacement (all 6-8 plugs) recommended when trans is out. 10-14 hours labor due to transmission R&R. Use brass plugs, not steel.

Estimated cost: $1,800-2,800

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting after sitting, cranks 3-4 seconds before firing, Loss of power above 4,500 RPM, lean conditions at WOT, Check engine light with fuel trim codes P0171, P0174, Surging or hesitation during acceleration

Fix: In-tank sock filter clogs with sediment, especially if car sat or used ethanol fuel exclusively. Requires fuel tank drop and pump module replacement. Filter is not serviceable separately on this generation. 3-4 hours labor. Recommend fuel system cleaning and fresh high-octane fill after repair.

Estimated cost: $600-1,000