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 1 The 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 2 For the purposes of this European Technical Report, the term ""% (m/m)"" is used to represent the mass fraction.