Amazon has the 3 pack 5 qt platinum high mileage for $42.58 with free Prime shipping. Pennzoil has a rebate worth $2 per quart right now, resulting in $30 back on the 15 quart purchase.
Shipping is 1-2 months out, so if you can wait it’s a pretty solid deal.
Product:
https://www.amazon.com/gp/product/B01MF97JE5/
Rebate:
http://www.pennzoil.co
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