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Message: <blockquote data-quote="teejay" data-source="post: 288291" data-attributes="member: 51">oil grades are used for different engine requirements. 15w40 maybe just about right for some but if your engine has not had any major overhaul, there could be a possibility the oil degrades faster- i.e. thicker, hence the reduction in volume. another possibility is the thicker oil remains in the top cylinder head due to its thickness and it getting thicker, but doesnt mean its gone to half the thinner 10w40 is thinner, thus doesnt seem to deplete , i.e. not getting held up in any part of the engine- good and bad.....good is you know the level, bad is the engine doesnt getting lube at first start, higher wear and tear there is also the properties of synthetic and mineral oil to consider, but that explanation will probably take me a book to write down.... faster if you type S Y N T H E T I C  VS  M I N E R A L    O I L in google.com</blockquote>