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My engine rebuilder recomended a slightly thinner oil for break-in of the rings, therefore 10W30 for break-in, then 15W40 later.
The thicker oil will probably work fine, but you want the rings to seat as quickly as possible, therefore the thinner oil is preferred.
I previously thought the straight 30 would be better, but at operating temps it is thicker than 10W30, so I have revised my opinion.
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84 Cab - sold!
89 Cab - not quite done
90C4 - winter beater
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