Oil additives usually come under the classifications of:
2. sulfur compounds
3. phopsphorus compounds
4. nitrogen compounds
They have the following disadvantages:
1. Chlorine compounds: Oils blend with chlorine compounds show an increase in film strength. It is common for those selling chlorine based oil additives to demonstrate the high film strength on the Timken or similar bearing machine. However, the most stable of chlorine compounds, when burned on the cylinder surface or piston tops, form hydrochloric acid which is corrosive. It is also known that chlorides add to oil drag.
2. Sulfur compounds: Sulfur compounds also add to film strength. However, in high temperatures and the presence of moisture they are apt to break down. They thus produce corrosion and high resistance to motion.
3. Phosphorous compounds: Phosphorous compounds likewise breakdown with the result being corrosive phosphorous acid.
4. Nitrogen compounds: At elevated temperatures the oil film will break down and the bearings seize. Invariably, the presence of the above materials which increase the extreme pressure (E.P.) qualities of lubricants cause it to have high drag and produce early bearing fatigue. Therefore some additives which are in common use could produce relatively rapid engine deterioration.
5. Metal treatment: Metal treatments are supposed to treat the metal only and not change the characteristics of oils. Some oil additives claim to be metal treatments, but by using bearing test machines to demonstrate the immediate increase in film strength of oil and when having to be used regularly, it's apparent to see they are more of an oil additive than an actual metal treatment and probably fall into one of the above classifications.
Microlon is a one time metal treatment using oil and fuel only as a carrier for the Microlon resin. Results from using a bearing test machine to demonstrate Microlon usually turn out negative because Microlon is a true and proven metal treatment only.