After purchasing your product, I have noticed a definite improvement in running of my 1977 Jaguar XK8. The MPG is progressively getting better, with every mile I drive. The engine responds smoother and definitely sounds sweeter. Great product. Pity I did not know about your product earlier. Now bought further FTC’s to add to my Subaru H6 and VW Transporter T5 2.5. Many thanks.