Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 1998 Oldsmobile 88 owners, lightly cleaned up (personal details are redacted by NHTSA).
Tl* the contact owns a 1998 Oldsmobile 88. The contact stated that when turning on the vehicle, the check engine warning light illuminated. The contact proceeded to check the coolant in the vehicle finding that there was no coolant in the reservoir. When attempting to turn on the vehicle, the exhaust pipe in the rear of the vehicle released large amounts of white smoke. The contact stated that the when having the vehicle diagnosed by the dealer, the vehicle stalled. The dealer diagnosed that the engine failed and needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure. The approximate failure mileage was 36,000. The VIN was not available.
Engine using coolant but no evident leak. After a week of adding a little coolant to reservoir engine ran hot and hydro-locked due to cylinders flooded with coolant. Discovered plastic intake manifold had hole in it where the EGR tube entered plastic manifold allowing coolant to flood intake. This engine had 84K miles. Also discovered intake gaskets were replaced at 45K miles by dealer. Definitely an engineering defect.
In February I went to start my engine in the morning and it blew up. I turned the key, no engine turnover but smoke coming from under the hood. When I opened the hood, flames came out. The fire dept. Put out the fire and said the car was totalled. Some of the vinyl siding on my house was slightly melted.
Tl* the contact owns a 1998 Oldsmobile 88. When the vehicle was started, smoke appeared without warning. The contact observed oil on the manifold. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The VIN was unknown. The failure mileage was approximately 120,000.
Car overheated without any visible signs of this but the red area of the gauge then the check eng light came on. Pulled to side of the road, checked it got it cooled down, then proceeded to the very next rd to gas station for better view of what was going on. Got to it very quickly and the temp was back up. Stopped let it cool and added water to the now empty resovair that was full when we started the trip. And no signs of leakage and no boiling over, let it cool. Added water. Then tried to crank it up, it would not. Had to have it towed to dealer, thought eng had locked up. Was told their was a feature to this car that shuts down the eng when a leak like this occurs. Wondering how many other people are taken because they thought the eng was gone......and it was not. But it somehow damaged the starter when all this happened. …
Gradually you will see a depletion of the anti-freeze from the holding reservoir. This is could be a sign that the intake manifold is beginning to leak anti-freeze (just a little) into the engine. Sooner or later when the erosion is large enough then a plume of white smoke will come out of the exhaust and you have no choice but to pull over and call the tow truck. I have replaced the engine intake manifold twice on my 1998 olds 88 due to degrading of the interior wall where the anti-freeze flows back into the engine. Both times the total cost of the repair (including plugs, wires, new manifold, labor) was around $1,200. On the last manifold GM had established adding a piece of metal where the anti-freeze was eroding the "space age plastic" intake manifold. Based on this, GM knows this is an engineering problem, but they will not take ownership of it and or pay for it.
Car was running rough, ESP. On starting. Made appointment with dealer who couldn't look at it for a week. We realized it was losing coolant, but there was no apparent leakage under the car or hood, etc. Filled with coolant, drove approx. 4 miles then engine light came on and stayed on. Checked oil and it was over "full". Called the dealer back with the new symptoms and was told it was a common problem with this type of car to have coolant leak into the oil (then into engine) and it probably needed manifold work $600.--$700. Had car towed to dealer where they found the manifold did need to be replaced. In researching, we have found that this is a common problem in 88's and sometime results in engine fires. We are wondering why there hasn't been a recall and why would the manufacturer use plastic in engine parts!?
Coolant leak into engine caused car to run extremely rough to the point of having to stop. The car would not restart. Had it towed to a repair shop. The engine had seized due to coolant leak resulting in damage to the head gaskets. The head gaskets along with the upped plenum had to be replaced at a cost of $1100. After research on your sight, I found this problem on several other 1998 olds 88 cars. I also found that a technical bulletin had been issued to dealers about this problem. Why wasn't this problem with the upper plenum that is referenced in the technical bulletin sent to owners of these vehicles. I found the many other model of GM cars also use the 3800 engine with a plastic upper plenum that can crack over time from excessive heat.
While merging into interstate rush hour traffic with no warning engine failed causing lost of braking and steering effectiveness. No warning was received. Vehicle was towed to dealer and upper intake was found cracked allowing coolant to enter combustion chamber. One week and $800.00 later car was "repaired" vehicle continues to experience fuel delivery problems. Hard starting, random stalling. Dealer advised me this is a common problem with the 3800 series ii engine regardless of mileage or type of use and maintenance. Considering the sudden lost of all power this is very dangerous as braking and steering effectiveness is reduced as is electrical power for accessories such as headlamps and windshield wipers.
Engine hydro locked when a crack in the plastic intake manifold allowed coolant to be sucked into the engine cylinders, causing the engine to lock up while my wife was driving it. Fortunately, no accident occurred, but this seems to be a very common problem due to what seems to be a design flaw by GM. We had to have the engine replaced, and the intake manifold, at a cost of $5,400.00. We heard that there was a class action lawsuit because of this problem, but people were just afforded a short time to act on it, and we were not even notified. Is there another suit that we can be a part of? We should not have had to replace an engine with just 44,000 miles on it.
Engine complaints in other 88 years
Frequently asked questions
How common are engine problems on the 1998 Oldsmobile 88?
NHTSA has 82 complaints about the engine & cooling of the 1998 Oldsmobile 88, 50% of the model year's 164 complaints. The component named most often is engine › gasoline (22 mentions).
Is there a recall for 1998 Oldsmobile 88 engine problems?
No. NHTSA lists no engine & cooling recall for the 1998 Oldsmobile 88, though it has 1 recall for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 1998 Oldsmobile 88 engine problems start?
Half of the complaints with a recorded mileage happened before about 73,000 miles.
Is it dangerous?
Owners linked 0 crashes, 10 fires and 2 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.