Level I

Level II

The following tests monitor coolant maintenance levels to ensure proper engine metal protection, glycol levels for freeze and boil point control, nitrite for prime metal pitting protection and acidity for adequate corrosion protection.

Level II testing monitors the corrosive attributes of the coolant itself - acidic or alkaline - in addition to metal movement - the corrosiveness of each metal affected. This level includes all Level I tests plus:

• Visual (color, oil and/or fuel contamination, magnetic/non-magnetic precipitation & odor)
• pH
• Glycol
• Freeze Point
• Boil Point
• Nitrites
• TDS (Total Dissolved Solids)
• Specific Conductance
• Foam
• Carboxylic Acid (ELC only)

• SCA # (Supplemental Coolant Additives)
• Total Hardness
• Corrosion Inhibitors - Iron, Copper, Aluminum, Lead, Tin, Zinc, Calcium, Magnesium, Phosphate, Borate, Molybdate, Silicate

Level III

Level IV

Level III testing identifies possible sources of problems detected in testing levels I and II, such as combustion gas leaks, air contamination, electrical ground problems, localized over-heating, chemical breakdown or other contamination sources inside or outside the system. It includes all tests in Levels I and II plus:

Level IV testing identifies the type and degree of degradation acid formation resulting from any cooling system problems identified by Level III testing. It includes all tests in Levels I, II and III plus:

• Contaminants - Nitrites, Nitrates, Chlorides & Sulfates

• Acetates
• Formates
• Glycolates
• Oxylates