That's too bad that Ray's post gets deleted and not the crazy comments from Jeff...
One thing i would like to add to this "soluble varnish" term that is getting widely used throughout the industry. There is no such thing as Soluble Varnish, technically it is a first stage acid build up in the oil that will show up in a Membrane Varnish Patch test when the oil cools down....One thing to remember is "Soluble Varnish" has nothing to do with removing varnish build-up from internal metal parts and reducing contamination particles. Absolutely nothing! Now the "Soluble Varnish" filters can make a lower QSA patch score and lower acid numbers, that's about it...turns out these acids will manipulate the varnish patch test used in the industry today.
One other thing to remember, Electrostatic filters do not remove additives from oil. Additives are "soluble" in solution and simply making the oil pass through an energy field doesn't change the chemical formulation or remove additives.
Please remember one thing. When testing for Varnish, the QSA or MPC patch tests are not ASTM approved and they have limits. When looking for varnish the best test is to simply look inside your system at metal parts. You should use patch tests as part of varnish prevention program, but add several other tests like particle count, FTIR measurements on Anti-Oxidation additives compared with the NEW oil samples, contamination testing, and keep doing your routing oil analysis through OEM lubricant supplier support. Varnish is complicated and it takes more than just a number on a QSA or MPC patch test to identify and properly remove. These test do not tell you anything about varnish build-up on metal surfaces. They only measure the levels of varnish in the oil at that present time.