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the relation to 5w flowing easier at start up is because like goat said that is the number that applies to Winter= cold temp. likewise your engine is colder at start than at operating temp.
After your engine warms up the number before the W doenst mean anything.
yes 10w would have more 'weight' at cold temps only
Last edited by dibbles : 7-2-09 at 17:13.
Reason: typo
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