my surf doesnt smoke unless the throttle is floored, then it blows black smoke not a great amount just for a few seconds, bought some wynns diesel additive today and can highly recommend it, took the filter off still full, i opened the tap at the bottom and let so much diesel drain into a bottle, see the $hit in the bottom on photo, emptied rest of diesel out and filled the filter with the wynns, topped up filter with clean diesel, then refitted filter, this is what it says on the can, this stuff doesnt go in the tank, took it for a drive like it says, 2 mile moderate driving, i went down the by pass about 60 to 70, got back missus drove it up street floored the pedal no smoke at all, me very suprised but it actually did what it says on the tin, first time ive used this because i usually use forte, not that many places stock it though, and its the first time the surf has had any additive in it, try it for yourself
, ive put a picture of the tin

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