Originally Posted By: Donald
I do not believe that MMO helps fix much of anything these days. No one on BITOG is doing real scientific testing, its all very subjective. Just too many variables and usually only one or two vehicles. Possibly MMO helped fix some things 25 years ago. But oils and gas have come along way in 25 years. I am very skeptical of any product that can be added to the gas or oil. If indeed MMO helped fix a problem with a car, there are other newer products that would work better.
Basically no auto maker recommends to add anything to the oil. They say in this day, that the oil has all the proper additives needed. Certainly there can be deposits around the valves and in the cylinders. The POA based cleaners have been proven to deal with that problem effectively. With respect to injector cleaning, there is fuel rail cleaning and then there is the removal and send the injectors out for cleaning.
I do have a container of MMO but don't use it much if at all.
If you have varnish, sludge or a sticking lifter [just to mention a few things] MMO fixes it the same as it did in the 1970's when I started using it for myself. Oil today is much better there is no doubt, but occasionally you'll come across something sludge prone, or neglected in need of help. For about $4 a qt MMO does better than products costing $15 a qt up to $50 a qt or more. As far as proof, I've seem enough visual results to be convinced, as have other members here. I don't think the chemistry of sludge changed all that much over the years. If anything it might be even easier for MMO to break it down now. JMO
As a side note if newer oils didn't form sludge, and engines were designed so that sludge couldn't form there'd be no need for Kreen or A-Rx either. But that isn't the case. Then we have people neglecting their engines, even the best oil in the world can't protect against neglect.