Originally Posted By: Miller88
It's very clear what I am saying. I am sorry you are unable to understand.
It's very clear above what I am saying is wrong with your statement. Now you've added innacurate and self-contradictory to the list, as well as expanding on the existing irrelevance.
Originally Posted By: Miller88
Lucas is very thick detergentless, additiveless oil. It does absolutely nothing except make the oil in the sump thicker and dillute the additives and detergents in the sump.
This may well be true for all I know or care, but this alleged inadequacy has nothing to do with noise reduction.
Originally Posted By: Miller88
"Low noise" is just very heavy. That's it. That is all Lucas has. It's just so heavy that makes it so you can't hear a lot of the noises an engine makes.
So you've used the terms "heavy" and "thick". These are not technical terms with a well defined meaning in this context, but I'll assume they relate to specific gravity and viscosity, respectively. It's rather unclear whether you think specific gravity or viscosity is responsible for the noise reduction, but you seem to be emphasizing specific gravity here. (perhaps its both?)
Originally Posted By: Miller88
20w-50 is similar in viscosity. Except it has at least something in it. It also would thicken the oil but not dillute the oil as much.
OK, now you have switched to viscosity and made a specific statement (along with a bit more irrelevance) which can be checked.
CPC gives "Heavy Duty Extra Special SJ/CD Motor Oil 20W/50" a 100C viscosity by ASTM D-445 of 17.28 Cst.
Lucas gives 110.0 Cst by the same method, so they are apparently NOT "similar in viscosity", and adding the Lucas to 20W/50 is going to raise its viscosity.
So IF an increase in viscosity gives noise reduction, which I don't know, Lucas is likely to make more difference.
(The respective specific gravities are 0.8860 and 0.8956, but they give different methods, and Lucas F's about with Fahrenheit, which I can't be bothered converting.)
https://lucasoil.com/pdf/TDS_Heavy_Duty_Oil_Stabilizer.pdf
http://new.cpc.com.tw/division/lb/feature-text.aspx?ID=225