Right oil change time soon... I have got 2 different oils in mind that come with a K&N 303 power filter Oil is Silkolene Super 4 10w40 or Castrol Power 1 10w40 Both are £35-£40 and both are 4ltr... Any both know whats he best to use or are they both much the same? Sent from my GT-P3110 using Tapatalk