The 1998 Buick Riviera has no open NHTSA recalls. Owners report 4 recurring issue clusters, led by “Steering rack, column and steering wheel faults.” Buick uses the GM Oil Life System: an algorithm tracks engine revolutions and temperature, then lights the change-oil message — typically every 7,500 miles in mixed driving, capped at 12 months, using dexos-approved oil. Current Encore GX and Envista run 1.2/1.3L turbo three-cylinders where oil quality matters more than volume drivers expect (the sump is small and turbo-heated). Front-drive models pair to a CVT with a published fluid interval — it is not a lifetime part.
No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.
What drivers and federal regulators have officially reported about the 1998 Buick Riviera.
STEERING
6 NHTSA complaints · 1999-02 → 2007-10
“WHEN MAKING TURNS THE STEERING WHEEL LOCKED CAUSING THE DRIVER TO LOSE CONTROL”
“STEERING WHEEL TILT IS HARD TO UNLOCK. STEERING WHEEL HAS MOVEMENT WHEN LOCKED IN PLACE”
“WHILE DRIVING AT ANY SPEED AND WITH NO WARNING POWER STEERING FLUID IS LEAKING FLUID, MAKING IT HARD TO TURN STEERING WHEEL”
SERVICE BRAKES, HYDRAULIC
4 NHTSA complaints · 1999-10 → 2001-12
“ROTORS ON DISC BRAKES ARE RUSTING AND WARPING CAUSING IMPROPER BRAKE ACTION AND CAUSED ONE NEAR ACCIDENT INCIDENT WHERE MY WIFE WAS UNABLE TO BRING THE VEHICLE TO A COMPLETE STOP BEFORE BUMPING THE CAR IN FRONT OF HER”
“WHEN CONSUMER IS TRAVELING ABOUT SEVENTY MPH THE VEHICLE VIBRATES, AND WILL AUTOMATICALLY GO INTO THE OTHER LANE”
“UPON STOPPING VEHICLE HAS TO PRESS BRAKES DOWN HARD TO HOLD VEHICLE IN PLACE”
ELECTRICAL SYSTEM
3 NHTSA complaints · 2001-07 → 2003-12
“INTERMITTENTLY HORN BECAME INOPERABLE, OBSTRUCTING THE DRIVER'S SAFETY”
“WHEN TRYING TO BLOW HORN IT BLOWS INTERMITTENTLY. HORN HAS BEEN FIXED TWICE, BUT PROBLEM STILL EXISTS”
“CONSUMER STATES HORN IS INOPERABLE AT TIMES, ON ONE OCCASION HE HAD TO HIT THE HORN PAD SIX TIMES BEFORE THE HORN WOULD SOUND, DEALER HAS REPAIRED/REPLACED PARTS ON FOUR SEPARATE OCCASIONS”
ENGINE
4 NHTSA complaints · 2015-10 → 2016-09
“THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE VALVE COVER GASKET FAILED AND NEEDED TO BE REPLACED”
“WHILE THE VEHICLE WAS PARKED, THERE WAS A PUDDLE OF OIL DRIPPING NEAR THE ENGINE AREA”
“WHILE STOPPED, THE CONTACT NOTICED SMOKE COMING FROM THE ENGINE COMPARTMENT OF THE VEHICLE”
Issues on other model years
Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 20, 2026.
We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.
Critical for safety and preventing major damage
Change when the Oil Life System calls it — typically around 7,500 miles, never beyond 12 months. dexos1 0W-20 on modern engines. Small-displacement turbos (Encore GX, Envista): don't stretch the indicator.
Estimated cost — typical U.S. ranges
Dealer
~$120–$160
Shop
~$85–$115
DIY
~$25–$55
Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.
Rotate every 7,500 miles with the oil change — GM pairs the two in its schedule.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Often free at the shop where you bought the tires — worth asking before paying.
Inspect pads, rotors, and lines at every service. Older Centurys: check rear drum adjustment and parking-brake cables, which seize with age.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.
FWD Encore GX and Envista use a CVT: GM schedules fluid replacement around 45,000 miles under severe service — which includes most city commuting. AWD Encore GX uses a 9-speed automatic instead (see transmission fluid).
Estimated cost — typical U.S. ranges
Dealer
~$360–$500
Shop
~$255–$355
DIY
~$80–$180
CVT fluid is manufacturer-specific and pricey — do NOT substitute conventional ATF.
Keeps your vehicle running smoothly and efficiently
Conventional automatics (Century's 4T65-E, Regal's Aisin, AWD Encore GX's 9-speed): GM lists 45,000 miles severe / longer normal. Older Buicks respond well to a simple drain-and-fill — avoid pressure flushes on high-mile units.
Estimated cost — typical U.S. ranges
Dealer
~$330–$500
Shop
~$235–$355
DIY
~$60–$180
Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.
Small-turbo three-cylinders (Encore GX, Envista): roughly every 60,000 miles — check the manual. Older 3.1/3.8 V6s: iridium plugs last to 100,000 miles.
Estimated cost — typical U.S. ranges
Dealer
~$285–$390
Shop
~$200–$275
DIY
~$25–$100
Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.
GM schedules replacement around 45,000 miles; inspect at every oil change in dusty regions.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
5-minute job on most cars; the airbox lid usually has clips, no tools needed.
Inspect from 60,000 miles; replace on cracking or glazing rather than mileage alone.
Estimated cost — typical U.S. ranges
Dealer
~$195–$235
Shop
~$135–$165
DIY
~$20–$50
DIY-friendly if you can reach the tensioner. Inspect for cracks rather than swap on a strict mileage interval.
Extends the life of your vehicle and improves comfort
Replace roughly every 22,500 miles per GM's schedule — behind the glovebox on modern Buicks.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.
Dex-Cool is rated 5 years / 150,000 miles. On older 3.1/3.8 V6s, intake-gasket seepage was the classic failure — check coolant level and condition at every oil change on a Century.
Estimated cost — typical U.S. ranges
Dealer
~$285–$330
Shop
~$200–$235
DIY
~$25–$60
Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.
Test annually after year 3. Stop-start-equipped Encore GX/Envista use AGM batteries — replace like-for-like, not with a cheaper flooded battery.
Estimated cost — typical U.S. ranges
Dealer
~$225–$390
Shop
~$160–$280
DIY
~$130–$250
Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.
Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.
How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.
This maintenance schedule for the 1998 Buick Riviera reflects Buick's published service intervals and the GM Oil Life System system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.