Have you ever used anti-sludge liquids or sludge dissolve procedures?

[Wine_maker]

Quality of our diesel fuel is the worst so specialists in service recommended me to make some times the anti-sludge procedure by own hands. So he was not interested in this extra job.
I bought a one of the liquids with good recommendations (all of them has price 15-25$), and made the procedure according to the instruction like on scheme,



but left the car with liquids inside the cylinders for a whole night (not for 1 hour as it is written in instruction). When I first time start the engine it has a lot of dark smog with “awesome” smell, after 10 minutes of idling the smoke disappears. I didn't see any difference "before" and "after".
I’m not sure should I do it sometimes or not, because I use good quality oil and its must protect my engine from sludge.

[growler2058]

Mate i'm no expert but many years of playing have always said to me that diesels are dirty bast@rds at the best of times, my era (1990) and doubt its had too many treatments over its 500,000++kms its done and touch wood is still going strong

[canuck]

Personally, I would not do it. I think if you use a good oil and maybe every 30,000-40,000 kms do a crank case purge, with a product like Seafoam, you will be fine. Given the compression pressures and exhaust temps, I don't think you will find any sludge inside your precups or piston cylinders.

[Wine_maker]

He scammed me

[WhiteGU]

He scammed me

Who scammed you?

[Wine_maker]

Mechanic in service station.
Its joke, the anti sludge liquid doesn't have so big price to care about it =)