About a year ago my SDL suffered severe power loss, it wouldn't even go over 80mph, or over 3500rpm under load.

Then it became hard to keep the engine running on cold starts, as soon as the power steering pump put load on the engine it would die.
Eventually my SDL REFUSED to go over 30mph foot to the foor.


Brother gave it two bottles of diesel purge and it made a full recovery that day, and no he did not change the fuel filter till a few days later.


I believe it is a wonderful product.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

A problem like what you describe is typically due to a fuel flow problem such as a blocked filter. The solvent action of the DP would loosen that crap and force it through the system instead of remaining trapped in the filter where it belongs. The filter should have been changed since that's a hallmark symptom of fuel starvation, then troubleshoot if you had any air leaks causing further problems.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

The original poster never said what problem he was trying to fix. If it is a sticky valve body, pull it and soak in mineral spirits / cycle the valves / look for broken springs. ( This is assuming that there are no rubber parts in the valve body. )

There are few chemical additives that actually work.

Techron fuel cleaner is one for gas engines to remove carbon on the backs if intake valves. BMW had / has a huge problem with this and recommends this as a first step, step 2 is walnut shell blasting.

Bars Leaks tablets for cooling systems. This is great for seepy leaks, is stealth and won't clog a heater core / rad if it is any decent condition. It was even required by GM for the 80's HT4100 aluminum V8. This is also sold under the GM / AC Delco brand and probably other car makers. It is basically Ginger, a old farmers trick.

I've used Power Service diesel cleaner on some industrial diesels. I can't say that it helped to any great degree other than control sludge.

I would look for airleaks but I really have no idea how

__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.