Skip to main content

How do I select the right single grade piston engine oil

Piston Engine Oils (PEOs) have a high reputation throughout the general aviation community. Our partner AeroShell have been manufacturing and supplying PEOs for over 90 years, and these oils are used and trusted by more aircraft engineers and pilots than any other brand.

There are two main types of PEO: NON-DISPERSANT MINERAL OILS and ASHLESS DISPERSANT OILS

Non-dispersant mineral oils (straight single grade oils)

  • Blended from high viscosity index (HVI) base stocks
  • Do not contain additives except for a small amount of pour-point depressant and an anti-oxidant
  • Grades must be selected and changed to suit the climate(temperature)
  • Available in Grades 65, 80, 100 and 120
  • Used for the break-in process on new or recently overhauled engines. This helps the piston ring and cylinder wall mate together and create a good gas seal
  • Approved to SAE-J-1966(formerly MIL-L-6082E).

Ashless dispersant single grade oils

  • Blended from HVI base stocks and non-metallic additives to give exceptional stability, dispersancy and antifoaming properties
  • Used for the normal operation of all four-stroke aviation piston engines
  • Grades must be selected and changed to suit the climate (temperature)
  • Approved to SAE-J-1899 (formerly MIL-L-22851D)
  • Available in Grades W80, W100 and W120, as well as W80 Plus and W100 Plus
  • AeroShell Oil W80 Plus and W100 Plus are premium single-grade oils containing the standard additives of ashless dispersant oils plus an anti-wear additive, a corrosion inhibitor and a metal passivator. These advanced additives provide extra protection against corrosion, rust and wear.

Selecting the correct grade

The AeroShell straight and W series oils should be selected and changed to suit the climate.

 Outside air temperature °C  Corresponding SAE Number 
AeroShell Oil 65  Below -12 30
AeroShell Oil 80 and W80/W80Plus -17 to +21 40
AeroShell Oil 100 and W100/W100Plus 15.6 to 32 50
AeroShell Oil 120 and W120 Above 26 60