Kirkland actually has some of strickest guidelines for their products.....i do know they put them through a pretty severe test for most products and they have to be as good or better.....anything i have ever bought from Kirkland has been of good quality, and heck its probably mobil anyways, lol...….i would use it
if you change your oil when your suppose too you wont have a failure....ive never had one in almost 40 yrs of driving but if it makes you sleep better than buy that brand.....
just did mine other day at 2500 miles......Castor full synthetic (best deal) and yeah i will do all my own oil changes....for one i hate sitting around at dealer and two its bit less money and three i actually like doing it....after you have routine down its a 15 minute ordeal.....it would take me that long just to drive to the dealer
mostly its the time though but saving $70 on top of it doesn't hurt. lol