[quote author=hate_romania link=topic=67592.msg1162992#msg1162992 date=1169505296]
Motul 8100 Eco energy 5w-30
Mobil1 5w-30 (the normal one and maybe the extended perfomrmance)
German Castrol (green one) in 5w-30 or 5w-20 i know that the castol is a bit thick in comparation with mobil one.
amsoil xlm 5w-30
so any oil guru what oil will work better in the 2.3 engine
[/quote]
German Castrol is only available in 0w30 so mark 5w30/5w20 off that. Even though GC is a great oil, it's not a good match for our engines.
Mobil1 is a good oil, but after all the controversy lately, I wouldn't spend money on it.
My suggestion would be to take advantage of the super deals on Pennzoil Platinum synthetic. This oil has got to be the best bang for the buck on the market right now ($1.99 after rebate, some places as low as .99/qt.). I ran it for 7500K miles on my 2.3L and the UOA came back flawlessly. I am such a backer of Platinum that I stocked up 60+ qts. of it back in February. My 3 is going to be treated great by some Platinum over the next few years.
BTW, here's my UOA on Platinum in our engine:
http://www.mazda3forums.com/index.php?topic=59430.0