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Old 07-15-2009, 07:56 PM
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A few years ago I remember reading or hearing that straight weights have more "lubricity" because they require less additives due to the fact that multi-grades have longer molecular chains which break down more easily.
Many advances have been made to oils in the past several years so it might not be as true today but I agee with others who have said to follow your builder's advice.
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