there is a study about oil that i heard of somewhere at the other thread, that i think has to be of great interest for all to read. it is in post 4 of this thread:
https://www.northamericanmotoring.co...g-results.html it is absolutely beyond the wildest dream. the only problem i see is the length. is like if you have the bible printed in a roll without pages or index non stop. but also there is a way to google it. it is explained at the beginning. i found especially interesting near the end, section 6, chapters 30, 45, and 50. and the guy that published it brings data that you wouldnt find anywhere else. he did so many tests himself ! so, if really interested in learning a lot about oil, and find the time to read it, you will learn things that you didnt imagine.
https://540ratblog.wordpress.com/201...-test-ranking/