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<p>[QUOTE=&quot;Collecting Nut, post: 2233361, member: 74863&quot;]Think of your cars engine. If you use Valvoline you will not have this problem to the extent if you don&#039;t use Valvoline. All other oil in you engine contains Paraffin. Paraffin is a wax. Yes, it makes the parts in your engine slide with less wear but it also builds up that black stuff we call sledge or gunk. Eventually over time, that gunk builds up. It can get to the point that your engine will stop running. It&#039;s the same thing with a coin press. The grease builds up slowly, over time. The longer it builds the less impression you will see on the coin. You can&#039;t strike metal and get a clear sharp image when striking through grease, oil, water, etc. The grease build s up and then you end up with a coin like you posted. It&#039;s that simple.[/QUOTE]</p><p><br /></p>

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