I've got valvoline (cheaper) 10w-30 in my samurai with the hybrid engine. I'll be running that for the next 9000 miles, and then I'm thinking on either mobil1 or the dreaded expensive amsoil. Why the synthetics, for that mental safety factor (I do not know if it would ever do anything though), so I have some extra hidden safety margins (8500rpm!).. I dunno....
Castr(ated)ol SYNTEC ruined my rings on my old engine, that stuff sucks bad...
I really like Mobil1 synthetic, and if you don't want to use synthetic, Use Valvoline,
I have been impressed with it.
my old Dodge Grand caravan had 175K miles on it, and all I used on it was Valvoline,
changed every 3k and it still never burned a drop of oil during that 3k miles.
as for weight, it really depends on where you live, I use 5w30 what it recomends for the engine,
and have not had any problems.
Whatever happens to be on special at my local auto-parts store [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img]
I just change it VERY often.
Mobil 1 0W-30 in my sidekick 1.8. Used to run 5W-30 and noticed a huge difference going to the 0-30. The engine turns over much easier and the oil flows much quicker (can tell by the sound in the seconds after starting that it's not running dry nearly as long)