I needed 8 quarts of Rotella T4 for the old RV motor I'm dropping in the truck and figured I'p pick it up at AutoZone since I was getting a timing set there anyway. $18.97 for a four quart jug, so I got two. I was just placing an online grocery order for pickup at Walmart and decided to check the price on Rotella T4 (which you can order through grocery and pick up - so no going in the store). $12.97 regular price for the 4qt jug. Damn. Same thing with tranny fluid, freon, etc. I'm not buying fluids at the parts stores anymore. What a scam!!!