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Message: <blockquote data-quote="B33mEr" data-source="post: 345275" data-attributes="member: 13609">Bro ... 0W  means the weight of oil during cold and the weightage of oil when hot which 30W or 40W. The 1st which is 0W matters when cold and the 2nd set which 30W matters when in hot condition. I am oversimplifying it but that is the most basic understanding (that i understand <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />).Please refer to: <a href="http://www.bobistheoilguy.com" target="_blank">www.bobistheoilguy.com</a>  it's a well respected forum where tribologists, chemists, and oil analysis professionals  participate and contribute to the forum plus a wealth of material and resources when it comes to lubrication .</blockquote>