Hello together. I recently got a bottle of TEL ( Tetra-ethyl lead) and I have to say the difference is enormous (Ford sierra 1982 OHC 2.0) , hard to believe that the engine immediately runs much quieter and simply nicer . This replacement lead potassium-based additive is nothing….egal….I’m going to drive to UK now next week and the manufacturer is near , and selling the stuff kistenweise . Will I somehow make myself environmentally-legally punishable if I The manufacturer’s site says it’s aprooved…. If you’re interested, I can also bring something for you here http://tetraboost.com/tetraboost-e-guard-15/