The normal operating temperature for a 1999 Oldsmobile 88 with a 3.8L engine should be between
195°F and 220°F (90°C and 104°C). However, the exact optimal temperature might vary slightly depending on the specific conditions (ambient temperature, driving style, etc.).
If the temperature gauge is consistently outside this range, especially if it's running hotter than 220°F, you should have it checked by a mechanic to prevent potential engine damage.
