<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Johnny:
The largest private vehicle fleet in the world does not use synthetics. The vast majority of OTR trucks do not use synthetic oil. Oil is oil.
Yet again, if synthetics were worth the money, fleets would use them. They do not, because they are not worth the money. </div></BLOCKQUOTE>Sorry, but fleets do us synthetics. Lyons Transportation, back in the '80s tested a synthetic in one of their over the road tractors. They put a millions miles on the engine without changing the oil. They just topped it off when necessary. When that tractor hit a million miles the oil company paided to have it tore down and mic'ed for tolerance specs. It was still within spec's to put it back together without replacing anything except gaskets. They put it back together and retired it to the life of a city tractor in Buffalo, NY. It still had the same oil that was in the crankcase when they tore it down. When Lyons went out of business in the '90s, that tractor was still running.
Oh, someone said Cat does not recommend synthetic oil? Do not know where you get your info from because Cat sells a synthetic diesel oil with their name on it! Don't think they would put their name on it if they don't recommend it.