When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Depends where you from.....
if you live in my country,spring and summer with temps 40 Celsius,yes yuo should use a 10w-40,15w-40 or 5w-40
OF course if you live in Filadelphia,sure yuo gonna use a 5w-30
About brands,my opinion Mobil 1 or BP Visco7000(maybe only in Europe,this one)