Trop Artic from Sam's club 12 quarts $26. I think some Farm stores have it on sale for $2 a quart sometimes. Trop Artic and Motorcraft are both made by Phillips 66. PQIA VOA on them looks like they are nearly identical.
It depends on what we are comparing here. Motorcraft is similar to the Phillips synthetic blends. The blends from Phillips are the entry level of their lubricant business. If we are comparing Quaker State Advanced Durability (green bottle) this is the Quaker State entry level offering also meeting the same specs as the Phillips "synthetic blend" portfolio.
The Quaker State Enhanced Durability(synthetic blend/gold bottle)
is a different tier of product.