However, generally, older vehicles like a 1998 Suburban often used 5W-30 or 10W-30 oil.
* 5W-30: This is a good all-around weight for most climates. The "5W" indicates its performance in cold weather, while the "30" indicates its performance in hot weather.
* 10W-30: This is slightly thicker than 5W-30 and is suitable for warmer climates.
Using the wrong oil weight can damage your engine. Consult your owner's manual first; it will clearly state the recommended oil viscosity (weight) and type (conventional, synthetic blend, or full synthetic). The information is usually found in a section dedicated to maintenance.
