Shell Rotella 15-40 Synthetic

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Apr 27, 2014
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FL USA
I purchased Shell T6 15W40 full synthetic for my Subaru 10 Hp and Briggs Vanguard 9 Hp generators.
Is that ok for the high humid South Florida summer time temps?
 
I usually run them every month for about 20 minutes using E0 fuel until carb is dry.
 
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