1990–1997 BUICK REGAL

Typical onset: 60,000-120,000 mi

Symptoms: Dexcool coolant leaking externally around intake manifold base, Coolant mixing into crankcase oil (milky dipstick), White exhaust smoke on cold starts, Overheating or persistent coolant loss with no visible external leaks

Fix: Replace lower intake manifold gaskets with updated metal-core versions (Felpro MS98000T preferred), upper plenum gaskets, thermostat, coolant flush. If oil contaminated, add oil changes at 500 and 1500 miles post-repair. 6-8 labor hours if caught early; if coolant entered cylinders and hydrolocked or damaged bearings, add engine rebuild.

Estimated cost: $800-1,200 for gaskets alone; $2,500-4,500 if bearing damage or rebuild required

Typical onset: 80,000-150,000 mi

Symptoms: Strawberry milkshake or pink foam in radiator overflow or on radiator cap, Transmission slipping, delayed engagement, or erratic shifts, Coolant level dropping with no obvious leak, Transmission fluid appearing thin or discolored on dipstick

Fix: Replace radiator (internal cooler fails, letting coolant into trans lines), all transmission cooler lines, flush transmission multiple times or replace if heavily contaminated. Often requires transmission rebuild if coolant circulated through valve body. 8-12 hours labor for lines/radiator/flush; add 15-20 hours if trans rebuild needed.

Estimated cost: $1,200-2,000 for lines/radiator/flush; $2,800-4,500 if transmission rebuild required

Typical onset: 90,000-140,000 mi

Symptoms: Loud grinding, whining, or squealing from front of engine under boost, Sudden loss of boost pressure or power, Metal shavings in supercharger oil reservoir, Catastrophic engine damage if coupler disintegrates and debris enters intake

Fix: Remove supercharger, replace input coupler (upgraded aftermarket units recommended), front snout bearing, seals, and supercharger oil. Inspect intake manifold for debris. If debris entered engine, cylinder heads may need removal for cleaning or engine rebuild. Preventive replacement recommended at 100k. 5-7 hours labor for coupler/bearing service.

Estimated cost: $800-1,400 preventive; $3,500-6,000 if engine damage occurred

Typical onset: 70,000-130,000 mi

Symptoms: Oil seeping from valve cover edges, especially rear bank, Misfire codes on one or more cylinders (P030x), Oil pooling in spark plug wells, Burning oil smell from engine bay

Fix: Replace valve cover gaskets, spark plug well seals, inspect coil pack towers for oil intrusion and replace affected packs. Clean spark plug wells thoroughly. 3-4 hours labor for both valve covers and coil packs.

Estimated cost: $400-700

Typical onset: 100,000-180,000 mi

Symptoms: Oil dripping from bell housing area or oil pan seam, Oil spots on driveway after overnight parking, Low oil level between changes with no visible top-side leaks

Fix: Rear main seal requires transmission removal (8-10 hours labor). Oil pan gasket is easier but requires engine support and subframe lowering on some years (4-5 hours). Often both are done simultaneously if transmission is out.

Estimated cost: $600-1,000 for oil pan alone; $1,200-1,800 for rear main with transmission R&R

Symptoms: Soft or spongy brake pedal, Brake fluid leak visible at frame rail near front wheels, Pedal sinking to floor under sustained pressure, Visible rust or corrosion on steel brake lines where they contact frame brackets

Fix: Replace corroded sections of steel brake lines, typically front circuits. Requires bending and flaring new lines or using pre-bent sets. Bleed entire system. 3-4 hours labor for front lines.

Estimated cost: $350-600

Typical onset: 120,000-180,000 mi

Symptoms: Slipping or flare on 1-2 upshift, No 2nd gear engagement (goes 1st to 3rd), Harsh or delayed 1-2 shift before failure, Check engine light with transmission-related codes

Fix: Transmission must be removed for band adjustment or servo replacement. Often requires full rebuild if metal contamination is present from worn band. 12-15 hours labor for removal, rebuild, and reinstall.

Estimated cost: $1,800-3,200