the correct weight and type of oil, changed at the appropriate interval, will not require any supplements.
This is my position also, assuming a quality lubricant is used.
I used to use it all the time, along with my 0w-40 synthetic oil, and I was getting too low of oil pressure at 5500 RPM on my 383 stroker. I didn't put any Lucas oil stabilizer this time, and my high RPM oil pressure is now back in the comfort zone. Just my experience.
This could very well have been the result of foaming, this product has been accused of this.
(partially from a prior post)
Generally, oil "Improvement Additives" fall into 3 categories.
1. Viscosity improvers- Products like STP Oil Treatment, Motor Honey, etc. They contain long chain hydrocarbons that raise the kinematic viscosity of the lubricant, thereby temporarily reducing blowby and smoking, and also raising oil pressure. They also tend to quiet a loud engine with slop in the valvetrain. A mechanic in a bottle:sick:.
2. Chlorinated additives- Products like Dura-Lube, Militec, Prolong, etc. These additives have high concentrations of chlorine and can create hydrochloric acid in internal combustion engines, rapidly reducing the TBN (Total Base Number) of your engine oil which can affect non-metallic surfaces and ultimately metal surfaces, causing internal corrosion, pitting, etc. Most use an extremely cheap Group I base stock carrier oil with a high paraffin content, and can significantly contribute to deposit formation. They use Chlorides because they are slippery, anyone ever seen Chlorox used in a burnout pit?
3. Solid Film or Colloidal additives- Products such as Slick 50, T-Plus, Restore, etc. contain teflon/ptfe, molybdenum, or graphite. These add solids to the oil system, again usually with a cheap low quality Group I base stock carrier oil, which adhere to metal surfaces, theoretically inducing a burnishing process (you've seen real burnishing causing the wear lines on the race of a wheelbearing after use, it deforms the surface of the metal due to pressure and sliding action). Unfortunately, these solids stick to each other as much as anything else, forming larger solids, clogging filters, and possibly blocking oil galleries.
Solids may also dam up around bearings, reducing oil flow. Teflon/PTFE can react with some metals such as aluminum and magnesium at high temperature, causing ugliness in turbo applications.
Cliff Notes Version:
High quality oils (you know which ones they are) are specifically designed to perform under given conditions. The additive package in Red Line vs. Mobil 1 (just using them as examples) are completely different because of different base stocks(Group V vs. Group III/IV). Adding a one size fits all additive is a gamble, you just can't know what the results will be.
Most quality product manufacturers specifically recommend not to use an oil additive, and so do I.