I recently decided to try some Lucas brand oil stabilizer. I changed my oil, added two bottles/quarts of the stablilizer and then the rest with 15W40.

I had some oil consumption and blowby before this.

Lucas stopped most of the blowby and I have driven well over 1500 miles since my oil change with no oil consumption whatsoever! I am amazed at this product.

I was getting about 23-25MPG before the Lucas. We went on a trip this past Monday of several hundred miles and we were getting 28.5 MPG!!! And on that trip my odometer clicked over to 265,000 miles.

I got an increast of 5 miles to the gallon. I did not change anthing else. I am using Power Service fuel treatment in the silver colored bottle.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup

I've been thinking of trying that stuff but I'm very reluctant to spend my $ on miracle fluids. Maybe this one is worth it. I guess I'll see what happens.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?

That is consistent with the variation between stop-and-go city driving and highway mileage on a long trip.

Sidebar comment:
I've observed the economy in my 300D change +/- 2-5mpg between tanks of fuel while driving under the same conditions...ie, in town commuting, same route. I suspect that some batches of pump diesel have more giddy-up than others.

If the oil will light off at 22:1 compression, a diesel will run; it just won't make as much power. OTOH, a gasser ingesting snotty fuel will generally have pistons and valves chattering at you most vocally.

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Never a dull moment at Berry Hill Farm.

I hear the fuel treatment is pretty good. But you may want to look at THIS

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1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

How to eliminate oil dependency through market-driven approaches.
“We could cut oil use in half by 2025, and by 2040, oil use could be zero,”
The Sound of Diesel Speed
Ode to MB

Hi,

Whoa, I love garage science. That was an eye opener, I was really thinking of putting some stabilizer in my 240D manual tranny to get rid of a grinding noise at startup. Maybe I'll just leave it be. It sounds like dry parts that take a few seconds to get lubed up probably on the primary shaft. I'm just another dummy suckered into using that stuff at the parts counter while twirling the gear gismo.

About the blow-by on the highway vs. town, this makes tons of sense! I always wondered why my Saturn SW2 (notorious oil burners 1qt/1000mi) didn't burn a drop on a 400 mi highway trip from San Jose to Los Angeles. I talked to the Saturn Engineers who do blow-by flow testing (I designed the NTK M100 Blow-by meter years back) and they claimed after much arm twisting that the car had a problem and it happens when you chop the throttle (high vacuum).

My 240D burns 1QT every 1000mi. This is a little different, I notice if I drive on the highway at 70 it'll go through oil fast. Stop and go isn't so bad. I have removed the cyclone oil collector (was cracked) and just looped the vent to the intake. Till I figure out a better way to collect and condense the vapor, I'll send it to the intake and carry a quart of oil in the trunk.

Back when I designed blow-by meters, I used to collect the goo that built up in the flow meters. You don't want this sh.t going back into your oil. It was a mixture of fuel, oil and water. Maybe 20% water. So, I've been reluctant to replumb the separator.

Cheers,
Yoko

PMARI, Good Work ! Great reference specific to this thread...

I have been using the Lucas Oil Stabilizer in my engine oil and it doesn't froth like that. Wouldn't the frothing be apparent on the crankcase dipstick? Perhaps his experiment is flawed with possible air compression through the gear teeth?

My oil consumption is down with the additive in the oil but I am not quite sure of the quantity since the dipstick obviously doesn't have any capacity markings. Also the car is rarely parked on level ground overnight so I don't think I am getting accurate readings. I'll have to set up more scientific tests.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

The use of Penzoil in this experiment makes me wonder how much this guy really knows about oil but overall a decent experiment. Did he really prove anything other than a color change?

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?

What I noticed was the difference between the synthetic blend and the fully synthetic oil. The blend performed better.

Also the experiment could be flawed because when he added the lucas he changed the amount of oil in the sump. With the lucas added there was more volume of oil. The experiment should have been done with the same volume of oil at all times.

Overall a decent experiment though. Makes me glad I used the Blend in my differential.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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I’ve used Lucas stuff for years and I really like it. I have stabilizer in the engine, tranny, transfer case and both differentials. In the front hubs is Lucas “hub oil”.

I just got back from a 3700 mile trip in my 616 powered Rover and used less than a quart of oil, and that was with a filter change half-way thru. (It has a remote filter set-up) Taking the filter into consideration the truck used maybe 8 oz.

I’ve never noticed any frothing, and yes, I had to check the tranny multiple times when it was hot as it developed a leak shortly after the trip started. Nice, clean, stable oil, just as you’d expect.

Jim

Our 240 burns very little, if any oil when the oil is fairly fresh. When it gets near 3000 miles or more, it will burn more oil. That could be the reason for the decrease in oil consumption in your engine.

My engine uses almost no oil (that I can tell....it leaks a little at the front of the valve gasket and also does some blow by into the air cleaner) so I account most lost oil to that....since in 3000 miles+ of driving per change the amount I add is maybe .3 to .5 quarts to keep it in the middle of the dipstick. I can still hit 30mpg on the freeway if I am gentle on the pedal and do 60-65mph.....even with my "blowby" which isn't all that much, the engine can move like a rocket, no lack of power whatsoever. Our 83 has virtually no blowby at all, even cold, you can take the oil cap off and nothing comes out! However, mine still moves faster....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

maybe i'm just conservative when it comes to the old cars, but i don't think my cars have seen oil additives during their lifetime (probably nieve on that one) and i just don't want to insert any big changes into two engines that seem to be running fine. i just use mobil 1 and add the additives, rarely, to the fuels.

what would the lucas stabilizer do in a fuel tank for the diesels? i'm not rushing off to test this either.

i enjoyed the link to the bobistheoilguy posting

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PagodaLOVER
1967 230SL, manual
1959 180D, manual

I think it just boils down to this, Mercedes-Benz does not endorse oil additives of any kind, but they're ok with certain fuel additives, until recently, Redline diesel fuel catalyst was available at a local MB dealer.

-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.