that chart of different oils and viscocities and additives needed is good to know. I routinely buy on sale citgo superguard or mobil super 5000 or even blains farm and fleet branded all conventional motor oils and all pass the testings. All are on sale or regular price from anywhere to 1.50 to 2 bucks per quart and changing oil every 4500-5K tops oil changes every 3-5 months on 4 vehicles is assuring to know oil is decent quality for price paid.
I see no need for full synthetic oils unless mfgs. require them since if change oil every 5000 miles or less regular conventional oil is fine. Been doing that since the 1980s and have not changed since but use to use quaker state oils for a very long time in decades past.
