I will have to bow down to you on this one, as I said, I am not expert....I
did some google research cause it just seems odd to me, I read enough to
confuse me beyond hope, oil thickens, no well the properties change in the
way it clings to engine parts, there are different measures of hot and cold,
charts that make my eyes scream hey its all out there...so, my resolve is to
stick with Honda's recommendations which is (I just checked the manual) to
use 0-20, but if 0-20 is not available 5-20 may be used but it may effect
So, I am back to this, I do not change my own oil because it is far too
messy a way to save $10-$15 (I clearly do not enjoy this kind of work) have
it changed when the car tells me to and insure 0-20 is used.
Your mileage may vary.
I think it is more complicated than you think. The "W" in 5W doesn't
mean "weight" it refers to "winter."
The SAE specifications define "cold" and "hot". Hot is 100 degrees C
(212 F). Multiviscosity oils will behave differently than straight
weight oils at other temperatures. I think a more correct way to
express things is to say a 5W20 oil meets the low temperature
requirements of a 5W oil and acts like a 20 weight oil when hot. The
requirements for a 5W oil include things like a low temperture
cranking viscosity at -30 degree C, a low temperature pumping
viscosity at -35 degrees C, etc. (other "W" oils have different
requiremetns at different low temperatures see chart in
http://www.zddplus.com/TechBrief13%20-%20Oil%20Viscosity.pdf ). It
doesn't mean the oil has the same viscosity as a straight 5 weight oil
when cold, rather it means it has to meet the requirements for a 5W
oil (where the "W" refers to "winter" not "weight").
If you really wanna get confused go to Bobistheoilguy web site and
read how an oil's viscosity can change with use; i.e., that 0W20 you
put into the car won't measure 0W20 when it comes out (it'll be
Synthetic oil is probably cheapest at your local WalMart. A 5 qt jug
is about $25.
If it were my car, I'd feel comfortable running synthetic 0W20, 5W20,
0W30 or 5W30. Honda (or any other manufacturer) won't void the
warranty over oil viscosity; but they will over missed oil changes or
failing to keep the crankcase full (not more than a quart low).
Enjoy the new car.
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