Cheapest 10W 40 or 10W 30 and a nice Mann filter. Main reason for my ambivalence...outside of single-weight oils for small engines it has been at least 4 years since I say an SL or earlier rating on an oil. The SJ standard basically covers all you need to know unless you have a severe stressor like a non-water-cooled turbo or you operate consistently in temperatures above 115f in stop and go traffic.
I do agree that the need to clean the flametrap, hoses and potentially the oil separator goes down significantly if full synthetic is used but my oil change intervals are time based anyway due to the low driven miles per year.
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