This Technical Report gives information about bio-lubricants and recommendations for bio-lubricant (and bio-based lubricant) related terminology. These recommendations are based on a discussion of commonly used terms in this field.This Technical Report also briefly describes the current test methods in relation to the characterization of bio-lubricants. It presents recommendation for related standards in the field of biodegradability, product functionality, impact on greenhouse gas emissions and te amount of different renewable raw materials an/or different biobased contents used during manufacturing of such bio-lubricants forming one product group.The criteria of the European Ecolabel for Lubricants ("EEL") [2] includes the terms discussed in this paper.NOTE 1The European Lead Market Initiative ("LMI") [3] defines the term "bio-based" as described in Table 1. It is important to mention that "bio-based" does not imply "biodegradable". In addition, "biodegradable" does not imply the use of "bio-based" material.NOTE 2For the purposes of this European Technical Report, the term "% (m/m)" is used to represent the mass fraction.