Hi there,you can't go wrong with Shell. I heard of many cars that ran on Castrol and used oil till they changed to Shell then the oil usage stops. I also believe that Shell cleans your engine. If you put it in an engine with sludge,it loosens the sludge and unfortunately blocks your oil pick-up. I've used Shell all my life and never had problems with it. It still is your decision. Keep well.
Oo,don't top up with a different oil then your car runs on,rather do an oil change if you want to change to a different type [WINKING FACE]