Here's my whole point. If properly changin dino oil will make an engine last more than a lifetime, why the HELL do you need anything else? OTR truck engines routinely log over 1,000,000 miles before a complete overhaul. Yeah, that's ONE MILLION MILES. I've worked on um, serviced um. Seen first hand that the dino oil works FINE in heavy duty applications. Necessity? My big ***. More like LAZYNESS. All the synthetics are good for IMO is strecthin out oil changes. Since synthetics cost more, the cost balances out. I say run whatever the manufacturer says run, keep it changed at the recommended intervals and you'll be fine. Millions of people have been doin just that for a long time and it WORKS just fine. We ain't flyin around in high dollar aircraft or drivin around in multi million dollar tanks. Sayin synthetics are a necessity when your owners manual doesn't require it is a stretch at best. A fool and his money are soon parted.
