i forgot to mention

I'll buy 4 One Liter containers, Use 3 in the engine and keep one as a top off spare

i'm still debating which oil to use. right now i'm leaning towards
Mobil 1 0W20 or Castrol Syntec 0W30, i've read somewhere that mobil tends to make their oils a little thinner than castrol. for example, the mobil 0w40 is on the lighter side of the 40 weight and is closer to 30 weight. On the other hand castrol syntec oils tend to be on the heavier side; their 5W30 is on the heavy side of the 30 weight and is closer to the 40s. This is why most BMW (E46) owners use Mobil 1 0W40 instead of the recommended 5W30 Castrol Syntec oil. Either that, or they use Castrol syntec 0W30 german green oil because it's perfectly weighted at 30, however, this oil is not available everywhere where i live and the Mobil 0W40 is only available at mercedes benz dealers for $9/L.

I'd be glad to try the castrol Syntec 0W30. I'm not buying the oil primarily for fuel economy, but more for protection for my engine. I dont want to end up buying oil which is too thin which can fail to reach all the places in the engine.

any comments or suggestions are greatly appreciated.

thanks,

gj