What type of oil can you use in a 2002 trailblazer 5w-30 or 10w-40?

For a 2002 Chevrolet Trailblazer, the recommended oil is typically 5W-30. While 10W-40 can be used in certain conditions, it is generally not advisable for standard use, as it may not provide the optimal performance or protection for the engine. Always check the owner's manual for specific recommendations and consider the climate and driving conditions when selecting oil.