ONYX 54300 is a medium ash mobile heavy-duty natural gas engine oil additive package. It provides improved performance for mobile heavy-duty engines fueled with Compressed Natural Gas (CNG) or Liquified Natural Gas (LNG).

ONYX 54500 is a premium low-ash natural gas engine oil additive package. It offers improved performance for engines fueled with Compressed Natural Gas (CNG) as well as Biogas.