Yeah, that doesn't tell us much... Which car did you add it to and what were you hoping to improve?

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

81 240D with unknown milage it smokes real bad.

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06 VW Jetta TDI

What have you done to the car so far? Trying an additive, at least one that is added to the engine oil, should be done only as a last resort. Have you checked your valve clearances, timing chain and injectors?

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

Just stop around a maintenance facility that does maintenance on fleets of big rigs and just do as they do and not much more and that will end all the arguments about what is what and what is necessary. Enough said.
Bud

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1987 300D Turbo, 175k mi., 1998 BMW 323i Convertible, 1997 F250 4x4 7.3L PSD

Don't bet on it.

I'm surprised you put it in a 606, at 120kish miles you should have zero blow by, zero oil consumption and close to new compression numbers.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I have zero oil consumption and what seems to be no blowby, but I question the compression because of the cold engine noise that no routine maintenance cured. Also I have very limited maintenance records from the first owner who owned the car until 3 years ago. I don't even know if he or she did regular oil changes.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

OK, I'm done with the "Restore" experiment. I ran the additive for about 250 miles in both engines with no significant results. My OM606 did initially seem a bit quieter on it when cold, but it wasn't consistent and I think it had more to do with ambient temperature and the duration of afterglow. I still wouldn't dismiss the additive as useless and I think it's quite possible that it does raise compression to some extent, but I guess my compression was already pretty good.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

250 miles isn't much of a test.....

Based on the various testimonials, I should've felt something by then if my compression was low. I figured since my compression seemed OK those little metal particles floating around could only do harm so I did an oil change. It was time to do so anyway.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

Try some "Restore" in an old piston type air compressor and see if it builds to charge faster.


Btw, it will not make a difference (I have done this "test").

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Satan creates nothing: he only ruins everything. He does not invent: he tampers. And his followers are no different ~ Archbishop Carlo Maria Vigaṇ