Joint OICA and CLEPA presentation of industry-agreed automotive guidelines for life cycle assessment of passenger cars and parts. The guidelines establish a common global methodology for exchanging LCA values across supply chains. Key elements include: functional unit limited to passenger cars with declared units for parts; primary and secondary data approaches; chain of custody covering mass balance and book and claim; energy modelling allowing market-based and location-based approaches; representative vehicle concept for full vehicle LCA reporting; and representative part concept with interpolation for greenhouse gas emissions of declared parts.