Anyone ever used this on 1.9tdi bxe engine? Want to do it to mine but not sure which is the flow fuel line from the filter and which is the return. Thanks

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Not used that one but can recommend using BG244 or Archoil 6400-d which you can get through Powerenhancer.co.uk. I started using BG244 when my previous Mondeo just scrapped a pass on the smoke test with 2.97 out of an automatic fail of 3.0. First treatment took the readings to less than half. Annual treatments reduced it down to 0.14 and car ran very smooth with rough starts gone.

Both are simple to use. Just add to near empty tank before filling up. The tricky part is that you now need to drive as if you're driving Miss Diasy until you have a quarter of a tank left whilst the treatment dissolves the build ups in the fuel system. It's the hard part because the treatment boosts the cetane of the fuel and feels like you're using rocket fuel. At quarter tank fill up and drive normal you'll notice the difference straight away in smoothness and MPG.

I tried it about 12 months ago on my BKC engine. Helped make engine smoother and improved accelleration marginally. Followed this YouTube video: https://youtu.be/DuTTb_acdxs