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Message: <blockquote data-quote="Rkb53" data-source="post: 1038639" data-attributes="member: 74955"><p>Is there REALLY that much difference between 5 weight and 10 weight oil? That is what I really want to know. Does anyone out there have a write up report on the different rates of oil flow at a certain temp.? I have the same question for 20 verses 30 weight oil. We talk about tight clearances in an engine which is true. H however when you start a cold engine, the clearances are bigger and as the oil comes up to temp.and the engine too, the clearances get tighter not looser. I worked in the power equipment industry for 100 years and in snow blowers you always use 5 20 W oil. The W was for winter . Yes the clearances are not as tight as a modern engine but still they are not very different. Another thing, one year Ford says to use 10 30 oil. The next year it says to use 5 20. Nothing changed in engine design or clearances so why change oil? That is why I believe it is all for fuel economy and nothing else. How many people out there agree with what I just said? Do all of you only use 5 20 and no one uses anything else? I find that hard to believe.........</p></blockquote><p></p>