The 2004 Buick Regal, particularly the 3.8L naturally aspirated version, is a generally reliable W-body sedan, but the supercharged GS models suffer from catastrophic lower intake manifold gasket failures and transmission cooler issues that can destroy the 4T65E-HD transmission if ignored.
Lower Intake Manifold Gasket Failure (3.8L Series II)
Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Coolant mixing with oil creating tan milkshake sludge under oil cap, White smoke from exhaust on cold starts, Rapid coolant loss with no visible external leaks, Check engine light with misfire codes P0300-P0306
Fix: Replace lower intake manifold gaskets and flush entire cooling system; often requires new spark plugs and upper plenum gaskets while apart. 4-6 hours labor. If caught late, expect machine work on heads or complete engine rebuild due to coolant contamination in bearings.
Estimated cost: $800-1,500
Transmission Oil Cooler Line Failure Leading to Transmission Contamination
Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Pink milky fluid in coolant reservoir or radiator, Transmission slipping or delayed engagement after cooler leak starts, Transmission failure within days to weeks of coolant mixing, Hard shifts or no movement in gear
Fix: The factory cooler integrated into the radiator fails internally, allowing coolant into ATF. Requires immediate radiator replacement, external cooler installation, complete transmission flush or rebuild depending on contamination severity. If trans is damaged: R&R 4T65E-HD is 8-10 hours plus rebuild. Prevention means installing external cooler and bypassing factory unit around 80k miles.
Estimated cost: $600-4,500
Supercharger Coupler and Snout Bearing Failure (GS Models Only)
Common · medium severity
Typical onset: 100,000-140,000 mi
Symptoms: High-pitched whine or grinding noise from supercharger at idle or acceleration, Loss of boost pressure and sluggish acceleration, Check engine light with MAF or fuel trim codes, Rattling noise from front of engine
Fix: The rubber coupler between supercharger and snout degrades and the front bearing wears. Requires supercharger removal, coupler replacement, and often snout bearing replacement. 5-7 hours labor. Many techs replace the entire snout assembly while in there.
Estimated cost: $900-1,800
Intermediate Steering Shaft Clunk
Common · low severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunking or popping from steering column when turning at low speeds, Noise worse in cold weather or after sitting, No change in steering feel or control
Fix: The universal joint in the intermediate shaft wears and develops play. GM issued TSB and revised part. Replace intermediate shaft assembly, 1.5-2 hours labor.
Estimated cost: $250-450
Front Transmission Mount Collapse
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Excessive clunking when shifting from park to drive or reverse, Vibration at idle that changes when shifting into gear, Visible engine movement when revving in park
Fix: The hydraulic front transmission mount fails internally. Replacement requires supporting engine and trans, 2-3 hours labor. Use OEM or quality aftermarket; cheap mounts fail quickly.
Estimated cost: $300-500
Power Window Regulator Failure
Occasional · low severity
Typical onset: null
Symptoms: Window drops into door or operates very slowly, Grinding or clicking noise from door when operating window, Window sits crooked in channel
Fix: Plastic regulator gears strip or cables fray. Requires door panel removal and regulator replacement, 1.5-2 hours per door. Front driver door most common.
Estimated cost: $200-400
Owner tips
Install an external transmission cooler and bypass the factory radiator-mounted unit by 80k miles to prevent catastrophic trans failure
Check oil cap regularly for milkshake sludge starting at 70k miles; catching LIM gaskets early saves engines
On supercharged GS models, have coupler and snout bearing inspected at 90k miles before they grenade
Use Dexcool-compatible coolant only and flush every 50k miles; mixing coolant types accelerates gasket failure
The naturally aspirated 3.8L versions are solid daily drivers if the intake gaskets have been done; supercharged GS models are fun but need preventive transmission and supercharger work to avoid expensive failures—budget $2,000-3,000 for deferred maintenance on any high-mileage example.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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General Motors LLC (GM) is recalling certain model year 1998-1999 Chevrolet Lumina and Oldsmobile Intrigue, 1997-2004 Buick Regal and Pontiac Grand Prix, 2000-2004 Chevrolet Impala, and 1998-2004 Chevrolet Monte Carlo vehicles. The affected vehicles were previously repaired under recalls 08V-118, 09V-116, and 15V-201 to address the possibility that engine oil may drip onto the hot exhaust manifold.
Consequence: Engine oil that drips onto the hot surface of the exhaust manifold may result in a fire.
Remedy: The remedy applied under recalls 08V-118, 09V-116, and 15V-201 did not adequately remove the safety risk. Under the improved remedy, dealers will replace the engines front valve cover and gasket. Vehicles that are covered by recalls 08V-118, 09V-116, or 15V-201 that have not yet received the original remedy will instead receive the improved remedy under the original recall number. The recall began on February 19, 2016. Owners may contact Chevrolet customer service at 1-800-222-1020, Buick customer service at 1-800-521-7300, Oldsmobile customer service at 1-800-442-6537 and Pontiac customer service at 1-800-458-8006. GM's number for this recall is 15757. Note: Until the improved remedy has been applied, owners are advised to park their vehicle outside since the fire risk exists even when the vehicle is unattended.
ENGINE AND ENGINE COOLING:ENGINE · 15V201000
2015-04-06
General Motors LLC (GM) notified the agency on April 2, 2015, that they are is recalling certain model year 2004 Buick Regal vehicles manufactured April 9, 2003, to June 1, 2003, 2004 Chevrolet Impala vehicles manufactured April 8, 2003, to June 23, 2003, and 2004 Chevrolet Monte Carlo vehicles manufactured April 7, 2003, to June 23, 2003. On May 18, 2015, GM expanded the recall to cover an additional 49,751 2004 Pontiac Grand Prix vehicles manufactured January 6, 2003, to June 25, 2004. In the affected vehicles, the valve cover gasket may leak.
Consequence: The leaking engine oil can drip onto the hot surface of the exhaust manifold, increasing the risk of a fire.
Remedy: GM will notify owners, and dealers will remove the plastic cover and plastic oil fill tube extension and replace the front valve cover and gasket. These repairs will be done free of charge. The recall began on April 24, 2015. Owners may contact Buick customer service at 1-800-521-7300, Pontiac customer service at 1-800-762-2737 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 14574.
STEERING · 09E005000
2009-02-17
DORMAN IS RECALLING 979 STEERING KNUCKLES, DORMAN P/NOS. 697-902 AND 697-903, SOLD UNDER DORMAN'S "OE SOLUTIONS<SUP>TM</SUP>" BRAND NAME, AND NAPA P/NOS. 7-8502 AND 7-8503 WHICH WERE SOLD FOR REPLACEMENT USE ON THE VARIOUS VEHICLES LISTED ABOVE. A POTENTIAL MATERIAL OR DESIGN DEFECT COULD RESULT IN THE STEERING KNUCKLE BREAKING IN THE HUB AREA.
Consequence: A BROKEN STEERING KNUCKLE COULD RESULT IN LOSS OF STEERING CONTROL AND A POSSIBLE CRASH WITHOUT WARNING.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE STEERING KNUCKLES FREE OF CHARGE AND REIMBURSE THE REPAIR FACILITY OR OWNER FOR LABOR. THE RECALL BEGAN ON FEBRUARY 23, 2009. OWNERS MAY CONTACT DORMAN'S TOLL-FREE HOTLINE AT 1-800-523-2492 AND PRESS 5.
STEERING · 08E063000
2008-10-17
DORMAN PRODUCTS IS RECALLING 3,900 INTERMEDIATE STEERING SHAFTS DORMAN PART NOS. 425-151, 425-152, AND 425-153, (SOLD UNDER DORMAN'S "OE SOLUTIONS" BRAND NAME), BALKAMP #'S 7-3057, 7-3058, 7-3059 (SOLD UNDER THE "NAPA" BRAND NAME), AND PLATINUM PARTS #'S 2425151, 2425152, AND 2425153 MANUFACTURED DURING THE MONTH OF SEPTEMBER 2007. THESE REPLACEMENT STEERING SHAFTS CAN BE USED ON THE VEHICLES LISTED ABOVE. THE WELD CONNECTING THE INNER TUBE TO THE OUTER TUBE MAY BE DEFECTIVE.
Consequence: IF THE WELD FAILS, LOSS OF STEERING COULD RESULT, POSSIBLY RESULTING IN A VEHICLE CRASH.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE STEERING SHAFTS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 16, 2008. OWNERS MAY CONTACT DORMAN TOLL FREE AT 1-800-523-2492.
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