"Phil Budgell" <philbudgell@warp.nfld.net> wrote in message
news:aiyde.3018$Ph4.150021@ursa-nb00s0.nbnet.nb.ca...
>I am going to be doing a 6 day, 7500 km run accross Canada next week. I
>have a 99 Accord 4 Cyl with 100k kms on the clock. Right now I use Mobil
>5w30 with slight consumption (ie. 1 Liter/7500 kms). I understand that
>Mobil is a "thin" 30 weight and have been considering making the switch to
>German Castrol 0w30 which is a "thick" 30. Has anybody used this oil before
>or even a 40 weight in their 2.3's? Will I experience any real drop in MPG
>and will I cause any harm to my engine by using a slightly thicker oil in
>my car? I am trying to strike a balance between Valvetrain protection and
>MPG. Any input is greatly appreciated.

You're valve train won't be under much stress on a long cruise like that. Go
light.