Just local to the Spokane, Washington region Napa stores
Napa synthetic $3.29/quart
Napa dino $2.29/quart
Half price filters
Link:
http://napaspokane.com/#Home/1
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2012 Mazda5 - 0w20 cheaptest synthetic, 6 MO OCI
2013 Grand Caravan - 5w20 cheapest synthetic, 10k/OLM OCI