I really think we have to put heavy duty diesel engines in one category and consumer gas in the other.
I have to believe Kubota, Kioti, JD etc run their diesels for awhile to check pressure and performance.
But do I think Briggs "runs in" their 300E and 500E tiny disposable gas engines? No. I do wonder, however, if their Vanguard engines get any special attention.
Boy I wish we knew someone who worked in the Briggs US factory. I'm sure Kohler does the same thing. Interesting that the Kawasaki engine on my new CC lawn tractor specs a ten hour oil change and then mentions synthetic as an option, but that's all. I have a jug of Mobil 1 10-30 ready.
For lawn mower use, can't we buy "bargain" synthetic or a synthetic blend? Do the blends offer any advantage, best of both worlds?, or are they just there to save a dollar on the fill?
I've always bought synthetic oil for the small equipment when it went on sale and didn't worry much about the alphabet designators, oil ratings. Figured anything good enough for a car/truck had to work in a small engine. And it's almost always 10-30, not the 15-40 diesel oil. But is that true? Is any name brand synthetic a good synthetic, i.e. overkill to begin with? All I can say is I have never blown an engine in my life, so I guess I haven't done anything too stupid yet.