I'm not sure how this stuff, when added to the fuel, quieted the tappets.
Maybe you are trying to say that is somehow quieted the diesel knock/combustion sound?
Tappet noise is more directly related to engine oil.
So, maybe the MMO is helping to clean the carbon off the combustion chambers but not much else.

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U.S. Army Retired

I have been runing Diesels for years. MB, Volvo, Cummins, Ford, Jeep and VW.

I allways add a fuel additive. I have used Marvel Mystery oil (MMO), 2 cyc and several others. I have found that 2 cyc dose not add any power and in some cases clog up the fuel injectors. MMO dose help the injectors, add power??? and you have to add alot per tank. Did not see lots of change.

I would suggest using:

1. Lubribor, it is a super concentrated Lubricity agent designed for Ultra low Sulfur Diesel. This stuf is the best!!! You only add 1/4 oz to 20 gallon. The only bad thing is its hard to find in stores. Can be orderd on line.

2. Another good choice. Power Services it is made for Diesels. Two types Regular and Anti-gel for winter. Adds power cleans and lubricates. You can get it at parts stores and walmart.

Injectors and pumps cost alot. Using a good fuel additive is key. I have never failed a pump or injector on any engine yet. KNOCK KNOCK

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

Lubridor?
Wow, its so obscure not even Google can find it.

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U.S. Army Retired

it's a mystery.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

YA...Lubribor check it out: http://www.hammondscos.com/index.php?id=258

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

lubribor,
lubridor,
Labrador,
matador ,
herbivore,

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2005 Red KJ CRD, TOTALED 12-21-11

2005 Blue KJ Sport CRD, GDE, Magnaflow muffler, Destination AT, Amsoil filters, Fumoto, Timing belt and waterpump @ 99,600, 11 blade nylon fan, 2905 hayden fan clutch, EURO TC




Arguing about whether the glass is half full or half empty misses the point: the bartender cheated you.
Unknown

I have been using using ZDDP+ since 80K (110, now) and changing oil when it turns black at 4K, or so. (GDE tune keeps oil transparent for 2-3K.) 5-40 Mobil One mostly with 00-40 in dead of winter. Will see soon about rockers.

DOC

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP