Is it worth it to take a flyer on RP 5W30? I'm currently running Mobil 1 5W30 and to be honest I'm not that happy with it. Engines seems noiser and rougher than last oil change with the M1. I'm really looking to find some of the German Castrol 0W30 but am having a heck of a time finding it anywhere(hence my other post) So...any feedback on how RP performs in Toyotas? The stuff at Pep Boys has the SL designation..old stock or is RP not at the SM yet?