Both products share the same lubrication theory, but differ in blend ratio and viscosity. Main points are as follows.
Bell Hammer Seven
・High performance and versatile additive suitable for a wide range of vehicles from compact cars to imported cars
・Excellent balance of quietness, anti-wear, and durability, effective for long distance and heavy load driving
・Medium viscosity, forms a strong oil film without feeling too heavy
Bell Hammer Light
・Designed with slightly lower viscosity for small cars and low displacement engines
・Prioritizes smooth operation at high rpm and easy cold starts
・Lower viscosity resistance contributes to fuel efficiency and better throttle response
Both are compatible with engine oil and common lubricants. As long as not overdosed, there is no negative effect on viscosity balance or chemical reactions. Recommended dosage is 5–10% of the total oil. Choosing according to application brings the best results.