Here is the real world test results for various Additives available in Indian Market.

Fuel Additives Test:
Iftex System D:
Engine Power: No improvements
Engine Pick up: No improvements
Mileage: No improvements
Engine Noise: No improvements
Smoke Level: Reduced 0-5%
MP6TY:
Engine Power: Improved 5-10% after 3rd gear
Engine Pick up: No Improvement
Mileage: Increased 1-2 Km/Ltr in city
Engine Noise: No improvement
Smoke Level: Increased
AutoMax F2-21:
Engine Power: Improved 10-20% after 3rd gear
Engine Pick up: Improved 10-20%
Mileage: Reduced 1 km/ltr (???)
Engine Noise: No improvement
Smoke Level: Reduced 10-20%
Recommended Fuel Additives: AutoMax for City use, MP6TY for Highway Drive
Oil Additives:
STP:
Engine Power: No Improvement
Engine Pick up: Improved 10-15%
Mileage: - No Improvement
Engine Noise: Reduced 10-30%
Smoke Level: Increased
Bardahl:
Engine Power: Improved 20-30% after 3rd gear
Engine Pick up: Improved 5-10%
Mileage: - NO Change
Engine Noise: Reduced 10-20%
Smoke Level: No Improvement
OWS:
Engine Power: Improved 5-10% after 3rd gear
Engine Pick up: Improved 5-10%
Mileage: - Improved 0-5%
Engine Noise: No Change
Smoke Level: No Improvement
Recommended Oil Additive: Bardahl
Fuel System Cleaner:
OWS 360:
Smoke Level: Reduced to 5-10%
Engine Pick up: No Improvement
Engine Noise: Reduced 0-10%
Removed: 0% carbon from the Injectors
PUC level: Reduced.
Recommended Fuel System Cleaner: BG 244 (TATA Authorized)
Engine Decarbonization:
OWS 210:
Removed 10 - 20% carbon from the Cylinders
Removed 30-40% carbon from Pores
Removed 0% carbon from the Oil Bump
Manual Decarbonization:
Engine Power: Improved 20-30% after 3rd gear - 150kmph is no more a dream in TCIC
Engine Pick up: Improved 40-50%. Better than when we bought the car - May be because we uses better Gasket kit & stem seals than OEM.
Mileage: No Improvement
Engine Noise: Reduced 90%, Almost same as a Brand new car.
Smoke Level: Reduced 80% - Almost 'No Smoke'
Highly recommended for a Diesel Engine if crossed 1,00,000 kms.
Recommended Engine Decarbonization: Manual
GEARBOX Additive:
Bardhal
30 - 50% Smoothness in gear changes
Recommended Gear Additive: Bardhal
DIFFERENTIAL Oil Additive:
Nulon
No Improvements and we don't recommend this (it created clogging effects - Do not try this in your vehicle!)
Recommended Differential Additive: None
Warning: The above results are learned by experience for the last 4 years from a well maintained TCIC Safari car and not a Lab test results. We do not recommend any of the above products for your new/luxury car. BUY and USE the above products at your own risk!!!




