Mitsubishi/4G63

Mitsubishi · Naturally aspirated

4G63

Lancer Evo·CP9A·1999–2001

"The 4G63 is ready to take higher boost levels without even looking at internals — but neglect it and it will punish you hard."

SOLID

72/ 100

"Legendary tuner engine, maintenance is everything"

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Max HP

—

Torque Nm

5,000

Oil interval km

Recalls

Known issues

Known Issues

Narrow Rod Bearing Failure€1,500-4,500 · 80,000-160,000 kmCRITICAL

The 4G63 is well-documented for its narrow rod bearings, which are a known weak point especially under boost or on modified engines. Bearing failure can lead to spun bearings, rod knock, and catastrophic engine damage. Community forums have specifically flagged this as a priority concern requiring a dedicated solution.

Rod knock at startup or under load

Low oil pressure warning

Metallic rattling from lower engine

Oil contamination with metal particles

DIY: Hard

Oil Consumption and Valve Cover / Seal Leaks€200-800 · 100,000-200,000 kmHIGH

Community data from DSM and Evo forums highlights oil consumption issues on the 4G63, including leaks from valve cover gaskets and rear main seal. Oil found on spark plug threads is a reported symptom. High-mileage or boosted examples are more susceptible.

Oil on spark plug threads or tops

Visible oil seepage at valve cover

Unexplained oil level drop

Blue smoke on startup

DIY: Moderate

Water Pump Failure€300-700 · 100,000-150,000 kmHIGH

Water pump replacement is a well-discussed maintenance item on the 4G63 across DSM and Evo platforms. The pump is located behind the front case, making access labour-intensive. Failure leads to coolant loss and overheating risk.

Coolant loss without visible external leak

Overheating

Coolant weeping from front of engine

Whining noise from front engine bay

DIY: Hard

Cylinder Wall Scoring on High-Mileage or Overbored Engines€800-3,000 · 150,000-250,000 kmHIGH

Forum data notes that 4G63 blocks bored to 87mm are at the limit and prone to cylinder wall scoring. Sleeving is the recommended remedy when maximum bore is reached. This is particularly relevant for modified or previously rebuilt examples.

Increased oil consumption

Compression loss

Blow-by visible from oil cap

Loss of power

DIY: Expert

Transmission Gear Wear (3rd and 4th Gear)€600-2,000 · 120,000-200,000 kmMODERATE

Forum posts specifically mention gear clatter and loss of 3rd and 4th gear on 4G63-equipped Evos. The transmission is a known wear item, especially on driven or modified examples.

Clunking or clatter from gearbox

Difficulty engaging 3rd or 4th gear

Grinding on shifts

Popping out of gear under load

DIY: Hard

Oil Pump Wear€200-600 · 120,000-180,000 kmMODERATE

Oil pump replacement is listed as a standard rebuild item in 4G63 community rebuild guides, indicating it is a known wear component. Low oil pressure from a worn pump accelerates bearing wear.

Low oil pressure at idle

Oil pressure warning light

Engine noise under load

DIY: Moderate

Buying Checklist

Perform a cold-start listen for rod knock or bottom-end rattle before the engine warms up

Pull spark plugs and inspect plug wells for oil contamination indicating valve cover or seal leaks

Request full service history — confirm oil changes were done at 5,000 km or less with quality synthetic oil

Conduct compression and leakdown tests on all four cylinders to rule out cylinder wall scoring or ring wear

Test drive and engage every gear including 3rd and 4th under load to detect gearbox clatter or slipping

Ask for evidence of timing belt and water pump replacement history; treat unknown service history as overdue

Service Reality

Community oil interval5,000 km

Oil specification5W-40 full synthetic, community-recommended for turbocharged 4G63 Evo applications

Est. ownership cost (2yr)€1,500-4,000 per year depending on modification level, maintenance history, and whether drivetrain rebuilds are required

Real fuel consumptionNo data

Also Found In

Mitsubishi Eclipse GST/GSX (1G/2G DSM)Eagle Talon TSi AWDMitsubishi Galant VR-4Mitsubishi Lancer Evolution I–IXMitsubishi Space Star (some markets)

Buying Advice

The Evo VI 4G63 is one of the most capable and community-supported performance engines ever built, but it demands respect and consistent maintenance. The rod bearings and water pump are the two items that will end your engine without warning if ignored, so verify their service history before handing over money. Assume any example without documented oil changes at 5,000 km intervals has accumulated internal wear, and budget accordingly for an inspection or preemptive rebuild. A well-maintained example is a genuinely rewarding and durable ownership experience — a neglected one is an expensive lesson.

Parts People Buy

4G63 Rod Bearings (Upgraded)Link unavailable

4G63 Timing Belt Kit with Water PumpLink unavailable

4G63 Oil PumpLink unavailable

4G63 Valve Cover Gasket SetLink unavailable

5W-40 Full Synthetic Engine OilLink unavailable

4G63 Rear Main SealLink unavailable

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