I just purchased my new blower from Air Blower Services. How often should I lubricate it?


Regular lubrication ensures that your blower operate at maximum efficiency for a long period of time. For the Roots Universal RAI® series, the drive end requires grease and the gear end uses oil. Most other Roots blowers require oil to properly lubricate both the drive end and gear end.

Oil should be changed out after the first 100 hours of use. Most petroleum based oils are designed to last about 2000 hours if the oil temperature consistently remains around 180˚F (82˚C). If the oil temperature increases in 15 to 18˚ F (8 to 10˚ C) increments, the maximum life of the oil is cut in half. You can calculate the internal oil temperature by measuring the temperature of the air or gas discharge stream from the blower and multiplying the result by 0.8.

Roots Synthetic Oil is a good choice for your blower because it is 100 percent compatible with petroleum based oils and offers a longer life. It is engineered to last between 4000 and 8000 hours under the same conditions. It protects from corrosion and limits friction. It also offers high film strength and oxidation stability. Oil change intervals are two or three times longer with Roots Synthetic Oil than with other oils.

Oil viscosity hinges on ambient conditions that influence both the blower and driver when the unit is in use.

The required viscosity is as follows:

  • Ambient Temperature above 90˚F (32˚C) use ISO Viscosity No. 320
  • Ambient Temperature 32˚F to 90˚F (0˚C to 32˚C) use ISO Viscosity No. 220
  • Ambient Temperature 0˚F to 32˚F (-18˚C to 0˚C) use ISO Viscosity No. 150
  • Ambient Temperature below 0˚F (-18˚C) use ISO Viscosity No. 100

Synthetic lubricants extend the life of the drive and gear and should be used between oil changes. Shell Darina EP NLGI Grade 2 can be used in Roots Universal RAI® blowers with grease in the drive end. Gas blowers need a NLGI Grade 2 premium grade aluminum complex grease. It is a good option because it offers moisture resistance, good mechanical stability and a 300˚F (149˚C) service temperature. Avoid using any lithium based greases in your blower.