I am planning to change the engine oil for my Jaguar 2003 2.5 V6 exclusive automatic transmission. I have now short listed Castrol brand of two different viscosity. First is Castrol Edge 0W-30 and the second option is Castrol Magnatec A5 5W-30. Which one should I go for? I live in a part of Sweden where the temperature at very cold days doesn’t go below -15 degrees. Your recommendations will be much appreciated!