The thickness or viscosity of agarwood oil is not considered a reliable quality parameter. While some may assume that thicker oil indicates higher quality, the viscosity of agarwood oil is primarily influenced by factors such as extraction methods, storage conditions, and temperature rather than the resin content or purity. True quality indicators of agarwood oil include its scent profile, depth, complexity, and the origin of the raw material. Therefore, evaluating agarwood oil based on thickness alone can be misleading and does not reflect its actual grade or value.