Knowledge of the environmental conditions under which a unit operates can explain varying levels of Contaminant Metals. Excessive levels of dust and dirt can be abrasive and accelerate wear.

Contaminant Metals

Metal	Engines	Transmissions	Gears	Hydraulics
Silicon (Si)	Dirt, Seals and Sealants, Coolant Inhibitor, Lube Additive(15 ppm or less)	Dirt, Seals and Sealants, Coolant Inhibitor, Lube Additive(15 ppm or less)	Dirt, Seals and Sealants, Coolant Inhibitor, Lube Additive(15 ppm or less)	Dirt, Seals and Sealants, Coolant Inhibitor, Lube Additive(15 ppm or less)
Sodium (Na)	Lube Additive, Coolant Inhibitor, Salt Water Contamination, Wash Detergents	Lube Additive, Coolant Inhibitor, Salt Water Contamination, Wash Detergents	Lube Additive, Salt Water Contamination, Airborne Contaminate	Lube Additive, Coolant Inhibitor, Salt Water Contamination, Airborne Contaminate
Potassium (K)	Coolant Inhibitor, Airborne Contaminate	Coolant Inhibitor, Airborne Contaminate	Coolant Inhibitor, Airborne Contaminate	Coolant Inhibitor, Airborne Contaminate