5W-30. Good choice.My next oil change will happen this Fall. Costco 5-30 full synthetic oil ($71 for 20 quarts, delivered).
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Kirkland Signature 5W-30 Full Synthetic Motor Oil 5-quart, 2-pack FREE Shipping and Handling 2-5 Quart (4.73L) Bottles Advanced Wear Protection For Extended Engine Life Controls Thermal Breakdown Brand: Kirkland Signature Container Size: 5 Quart Container Type: Jug Oil Type: Full Synthetic...homedeliveries.us
Kirkland Signature 5-Quart 5W20 and 5W30 Full Synthetic Motor Oil, 4-pack FREE Shipping and Handling 4-5 Quart (4.73L) Bottles 1 Case of 5W-20, 2-5 Quart (4.73L) Bottles 1 Case of 5W-30, 2-5 Quart (4.73L) Bottles 100% Synthetic Formulation Helps Prevent Low-Speed Pre-Ignition (LSPI) Product...homedeliveries.us
Many consumers don't trust the Manufacturers' oil change interval, and go shorter, even if they use synthetic, so why do they trust 5W-20 oil, out of a barrel, when 5W-30 is also acceptable plus more robust (think engine longevity).