I perform lots of Oil Changes for Family, Neighbors and Friends. Some people have been burned too many times with being charged for oil changes that have not been done, bulk oil that burns a quart every 500 miles, being charged premium prices for inferior products or paying for a Premium Synthetic and receiving some bulk oil that is not to be used in automobiles.
No wonder some of these quick lube places want people to come back every 3K miles....they know that the oil is inferior and has to come out before the engine is toast.
When I see a sale on a great oil synthetic or Dino, store brand oil that has a great rep via VOA, or Diesel Synthetic/Dino oils I stock up. The same goes for quality oil filters like Bosch, Purolator, NAPA and M 1. I keep a good supply on hand.
I have a load of oil/filters in my stash that I mostly bought on clearance or on sale with nice rebates so the oil and filters that I have....are a real bargain.
Look for clearance specials with rebates at stores like Kmart. I loaded up with M 1, SM and SN, Castrol Edge with Syntec Technology in SM and SN, Castrol Edge in the Gold Jug, SM and Valvoline Synpower....all synthetics, all in gallons for $15 or less before any rebates....if offered.
Dino oils in PYB, Valvoline, Castrol, Castrol Tection Dino Diesel, Castrol GTX, SL, 15W-40 for $9 or less a gallon....and after rebates and sale prices...all for less than $1.25 a quart.
All these Dino oils currently have $7 rebates for 5 or more quarts.
When you see a great sale....load up....prices will not be low all the time.