That question cannot be logically answered as asked. What type of engine? What type of service? At what temperature ranges? Flat tappets or roller tapppets (makes a big difference).
Considering this is an "old" tractor forum, let's consider oil for probably 99% of the tractor engines dicussed here, along with stationary engines.
If some chump goes to his local auto-parts store to get multi-visc motor oil - it is MOST likely that oil will not have the proper lube requirements. Especially for engines that do not have roller-tappets on the camshafts. That goes for the cams that operate the valves and also the cams inside in-line fuel injection pumps. Gas engine motor-oil formulated since 2009 has lowered the anti-wear additives that older equipment needs. And, it's not going to tell you that on the label.
Now - if you buy racing oil, or tractor oil, or most diesel oils - you'll be okay for your gas and diesel engine tractors. Even the "Traveller" brand sold at Tractor Supply and made by Warren Oil has a high level of anti-wear additves.
Chances are if you go down to NAPA and buy 30W, you'll get some sort of off-road of diesel rated oil. But, if you ask for a multi-viscosity, you'll likely get a highway gas-engine oil that does NOT have the proper protection.
Shell Rotella T straight-grade 30W and 40W has an excellent flash point, good level of ZDDP, and a high HTHS (high temp-high shear) rating.
To the other extreme, if you insist on using only one grade of oil regardless if 105 F or 25 below F - then any multi-oil is better then any single-grade 30W or 40W . That because of the damage you can do during cold starts.
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