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Reply to "True Synthetic??"

"50wts do tend to seal the rings better than 30wts ... so the experts write on the internet anyway "

According to testing by these experts(http://www.iantaylor.org.uk/papers/Additives2001.pdf)using very sophisticated measuring equipment a 5W/20 oil provides a higher oil film thickness under the top ring of a modern 2.0 litre gas engine than 15W/40 and 5W/40 oils.
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