Originally Posted By: Gary Allan
Cost, mainly. You can get a 5w-20 in a conventional. A 0w-20 you cannot.
A couple of winters ago, I picked up some Honda 0W20 at the stealership for my 2006 Odyssey. The dealer was adamant - "It's only for the Hybrid". Whatever.
Anyway, it cost around $5 a litre, which led me to believe that it wasn't 100% synthetic (synthetics sell for around $8 a litre or higher up here).
The parts guy had no idea where it came from, but thought it was Petro Canada (who make other weights of Honda oil). I called Petro Canada and was told that the 0W20 was made by Idemitsu - all other grades in Canada made by Petro Can. He agreed that for that price it probably wasn't a full synthetic, but only Idemitsu (and Honda I guess) would know for sure.