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For synthetic Ive always ran mobile 1. That said I obviously dont have anything else to compair it against, but on the other hand Ive never had any reason to change to anything else either. *shrug*
Here in south georgia, mine says 5-30 on the oil cap. The manual (p221) says 5-30 for year round protection, 10-30 if it never goes below 20F where you live. The not Si models use 5-20 which is (probably) where your tech got his ideas from.
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