Chrysler 300 SRT8
392 cubic inches, 4.09-inch bore, 485 hp — the biggest factory NA V8 of the 2020s. Forged steel crankshaft where the 5.7 uses cast iron — the real upgrade. Powder metal rods, cracked-cap design. Pistons are hypereutectic, not forged — ring lands too thin for boost, supercharger kits crack them. Same MDS lifter failure on automatics — engine replacement $15,000. Manual 392s skip MDS. VVT and active intake give 45 lb-ft more than the old 6.1 SRT. On 0W-40 at 5k intervals, the rotating assembly outlasts the car.
First SRT8 300 — sleeper icon
431 hp in a full-size sedan — understated looks with boulevard performance. Cheap to find today, but 6.1L maintenance costs and MDS risk apply.
Engine Weaknesses 4
Same MDS failure as the 5.7 but with higher stakes. Deactivated rollers destroy camshaft, metal contaminates oil. Engine replacement $4,800-15,000 — replacements can fail the same way. Class action: Petro v. FCA. Manual 392s have NO MDS.
Symptoms: Progressive ticking to knocking, misfires, check engine light, metal in oil
Stock cast pistons not designed for boost. Ring land too close to crown, ring gap too wide. Supercharger or turbo kits crack pistons. Forged internals required before adding boost. Only affects modified engines.
Symptoms: Misfires under boost, loss of compression, knocking, catastrophic failure
Cast-iron manifold on aluminum head — thermal expansion mismatch breaks studs. Grade 8 replacement studs (6509863AA) are the fix.
Symptoms: Ticking on cold start from exhaust leak, disappears as metal expands
Same tick as the 5.7 from MDS valvetrain. Tick persisting past warmup signals lifter damage. 0W-40 synthetic at 5,000 mile intervals is the best prevention.
Symptoms: Ticking on cold start, may persist or disappear after warmup
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.
