Two problems related to engine have been reported for the 1998 Saturn SC2. The most recently reported issues are listed below.
The head on the engine block failed while driving on the highway. The head was full of holes, it was discovered by the dealer. Saturn refused the claim unless the vehicle was towed to another dealer. The vehicle smoked so bad that it almost caused a serious accident in which oil spilled over the highway.
Oil pressure suddenly changed and fumes came from under hood. I pulled car off interstate immediately and checked under hood. Upon checking oil, found that it was completely dry. I have kept regular maintenance on car, as can be verified by Saturn. Was told that engine would have to be replaced. The car is a 1998 Saturn Sc2 with 91,000 miles.