Searched threads, but nothing to my satisfaction. We run "synthetic blend" motor oil in all our small engines...as well as our spray trucks. Here's why: About a dozen years ago, we switched to "full synthetic" motor oil in our spray trucks. Oil pressure increased an amazing 10 psi in all trucks. Then we tried "synthetic blend" motor oil.........same psi as "full synthetic". So we now run "synthetic blend" lubricants in all engines big & small. As far as getting 25,000 miles out of an oil change.....mechanics warn that regular oil changes are still needed to keep the oil clean. Bottom line: we currently use "synthetic blend" motor oil (cheaper than full synthetic), grease, and gear oil. Any thoughts? Recommendations?