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My 1992 Caprice Station Wagon with L05 5.7 TBI V8 engine had been suffering from major blowby, to the point where my low oil level light was routinely coming on, even after top-offs, and I had to replace my PCV system with breathers. The breathers would then become routinely saturated with oil, and it became the norm to smell either crankcase stink, oil burning on the exhaust manifolds, or both at the same time. Oil level continued to be problem. At idle, a visble jet of blowby smoke emitted from both valve cover breathers.

On a whim, I decided to top off the system with MMO, instead of oil out of the 2 jugs of Rotella T5 I came to carry in my wagon. The first "benefit" I noticed was that the crankcase stink was replaced by the not-all-that-bad aroma of MMO.

After about 800 miles, fuel economy and power made a definite jump. Doing 95-100 on the highway no longer required alot of throttle pressure, and highway driving, even with the huge R4 AC compressor going no longer resulted in visual declines of the fuel needle. I started with about 11-12mpg highway when I bought her, and between the Seafoaming and MMO, she got up to 17mpg on the highway, the major emissions from the valve covers has ceased, and my daily check of the dipstick reveals the oil no longer goes anywhere but inside of the engine. After I tested the new AC Delco wires that came with the car at 9K ohms or greater, I replaced the wires with stainless steel marine wires (.9-1.1K ohms), and replaced the Delco platinum plugs with NGK double platinum V-Powers, netting a new highway fuel economy of 20mpg @ 90mph.

At 90, she'll sometimes get away from me and creep to 95 if I'm not paying attention, and will crack 100 easily with very little persuasion.

I'm completely not a believer in "repair-in-a-bottle" products, but in this one specific instance, it actually worked, so I thought I'd share.

I'm going to end up pulling the engine and doing lots of power/strength mods anyway, but in the mean time, I can drive her without the drama. :D
 

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having used MMO for decades the product for me is used to remove carbon deposits in the engine as well as clean the fuel system. this product over time will free up the compression rings if carbon-ed up providing better power fuel MPG.

as with any product more is not better... I use 3 OZ in the fuel tank on fill and 5 OZ in the crankcase. the product is not a solvent so when used it will not damage the rubber plastics injectors. I got 380K out of my 1983 and sold it with not engine problems .. passed emissions 20PPM HC..

Lifter noises this does eliminate by the cleaning action..
 

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MMO is awesome

I use MMO every other tank full of gas(6-8 oz) and use half a bottle in the oil for one day then do my oil change the next day. Need a little time for the MMO to breakdown the carbon and all the other stuff in the engine. The I add new oil. Do this every other oil change. Been doing this for the last 10-12 years on all my cars. I have a 1983 Cadillac Fleetwood Brougham 2 door with 255,545 miles and the engine still feels very strong for its year. I also add this to my tranny right before a tranny fluid change. I honestly do believe MMO works.
 

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I use MMO every other tank full of gas(6-8 oz) and use half a bottle in the oil for one day then do my oil change the next day. Need a little time for the MMO to breakdown the carbon and all the other stuff in the engine. The I add new oil. Do this every other oil change. Been doing this for the last 10-12 years on all my cars. I have a 1983 Cadillac Fleetwood Brougham 2 door with 255,545 miles and the engine still feels very strong for its year. I also add this to my tranny right before a tranny fluid change. I honestly do believe MMO works.

I never used MMO in the tranny. I do use transmedic which does clean up any deposits . put in prior to fluid/filter servicing.

since I have been using the dexos approved Mobil 1 synthetic engine oil I have had no reason to add to the crankcase ..

I do still use the MMO in the fuel ,so far all the vehicles run smooth no fuel component failures.

you 83 will run for a much longer time with this product . I only sold my 83 because of rust issues in the body mounts ..
 
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