Would mileage and performance in the Prius be enhanced by using 0W/20 or 0w/30 oil?hyperion said:There are several dozen recent threads on Prius and oil. I hesitate to mention that the 06 Honda Civic hybrid specifies 0W/20 wgt oil only to increase MPG. Combine that with a half quart low quantity and you may squeeze another couple miles per gallon.
Here..Here..Definitely agree with that one Dan!DanMan32 said:I'd be very careful if I were you. Sure, there is a great chance that the oil and filter will stand up to Amsoil's change interval. But all they will clearly state regarding voiding manufacturer warranty is that the oil itself meets or exceeds specifications, thus will not void the warranty, but does not clearly state that extending the manufacturer's change interval won't void the warranty.
Besides, as I have been saying for quite a while, it isn't just the oil breaking down that is a problem, but combustion blowby contamination. Nobody has been able to answer to my satisfaction as to why contamination is not an issue. I understand oil breakdown perfectly, but even oil that stays brand new will get contaminated.
Most synthetic oils for internal combustion engines are poly alpha olefins. These are synthesized from ethylene which is in turn "steam cracked" from petroleum. In principle ethylene could be produced from most any hydrocarbons including plants, but at present crude oil is the cheapest starting point.JDavies said:... Just what is synthetic oil made from/of..? It feels like petro..it smells like petro..etc...
(I've used castor oil in 2 stroke race engines and olive oil in the kitchen.)