I have a Land Rover Defender TD5. A friend of mine introduced recommended your product and although I was a little sceptical, I purchased the FTC03K, which was delivered next day. I popped them into the tank and washed them down one at a time with some diesel as per the instructions. WOW!! What a remarkable change there has been in my engine. It's smoother; much smoother, no more black smoke and none of the rattling noises anymore. I really can’t believe the change. Thanks for everything FTC. I highly recommend your incredible product.