"Also the local guy quoted me $6.70 for a quart of Castrol 10W-40 Syn. Is that a good price and who has it cheaper (Walmart?)"
Not a bad price. Walmart might be a little less. Think they sell more environmentally friendly (less packaging/qt) 5 quart jugs of synthetic. Autozone is also now carrying them. The big 'uns may be harder to find in 0W40 or 5W40.
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