It depends really on application, in general, no, but you need to compare costs.
Opie Oils are a great place to ask for advice and buy oil.
You learn a bit about oil from owning a car with an oil temperature gauge. When I had my first valver, I found the Castrol Magnetec ran hotter than anything else (as did others) so I now avoid this like the plague.
Don't know if this helps but when i first got my 172 i wanted to give it an oil and filter change so i bought the best halfords own brand 5w40 fully synthetic because it stated it was for performance engines and enthusiastic driving. NEVER AGAIN! Made my car tap and generally run rough. I change it every 2000 miles now and just use halfords 15w40 and it runs like a dream. And as for Castrol Magnetec, Its no better than the cheaper alternatives
i bought the best halfords own brand 5w40 fully synthetic because it stated it was for performance engines and enthusiastic driving. NEVER AGAIN! Made my car tap and generally run rough.
who makes oil? its dug out of the ground! waiting for the influx of comments lol :evil: