Join Date: Nov 2016
Location: Washington, the state
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With a very small number of exceptions, conventional oil is suitable for every other engine, unless a viscosity is specified that cannot be made from conventional stocks. 0W-20 and 5W-40 are two examples.
My Prime owner's manual calls for syn 0W-20 for 10,000 mile oil changes or 5W-20 for 5,000 miles. It doesn't differentiate between conventional or syn 5W-20--probably too confusing for most of the public. I do not think that anyone will notice a difference in engine condition when any top brand conventional or syn is used according to the manual. Any fuel savings is unlikely to cover the extra cost of syn. There are different qualities of synthetic oils, and a cheap syn is no better than a top conventional. Any of the top brands are excellent...Pennz, Mobil, Castrol, etc.
The advantages of synthetic are less thinning at very high temperatures and less thickening when very cold. They oxidize more slowly for a longer service life. Those few made from a PAO base have a higher film strength. Most oils marketed in the U.S. and Canada as "synthetic" are made from highly refined petroleum base oil called Group 3. Good oils, but not allowed to be called synthetic in the rest of the world.