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I would choose whichever is the cheapest which seems to be the Mobil Clean 5000 at $2.77 a quart or $11.50 five quarts jug at WalMart. Quakerstate is a great choice as well and is made produly by SOPUS who also makes Pennzoil, Shell, and Supertech (southern states) motor oils.
Everyday Wally prices, MC5k less expensive by the qt., QS less expensive by the jug @$10-10.50 which includes 5w20, not jug available with MC5k.
Fwiw, ST used to be XOM here except 5w20 and syn (WPP). Now WNE (on bottom) in all grades except 5w20 and syn which are still Warren Perf. Pack. (WPP). While still Warren Dist., not sure if WNE is the same as WPP or comes out of Warren Northeast (WNE,WV) with an unknown supplier.