pennzoil platinum is actually shell oil.. if u want the better shell oil, you want the quaker state q horsepower 5w40 synthetic, which is rebadged shell helix ultra. the shell rotella t synthetic 5w40 is also a massively good oil at low prices.

the mobil1 0w40 is really good, but the 5w30 and 10w30 is garbage as they changed the additive packages and blends in it.

royal purple puts out its own advertising as the best oil just like every other oil company... blanket statements that RP is the best lubricant is just stupid, and makes you look stupid.

ya ok where is this test send a link

on amsoil website, they say amsoil is even better

Seeing as most drivers would hardly notice a difference using an expensive premium synthetic, just stick to a regular OCI and you'll be fine.

Thanks captain!

uhh u r actually wrong
there was an independent company that did motor oil tests few years back, royal purple did pretty bad on the test. royal purple is not as good as people hyped about it.

My E30 is just about halfway through this test - in real life conditions.

I don't know. If you think about it, why spend so much money on oil when you can do oil changes more frequently than spend xxx amount on high high synthetic oil? Is it really worth it if you're DD'ing your car, and changing it every "3,000KM - 5,000KM' like they say when they advertise their car?

^
Have you owned a motor that is turbo or supercharged? They take more stress than a naturally aspirated motor. Synthetic does help to a degree.

i run dino oil on our cars at home, i change the oil every 5k. i have yet to find a reason of why i should switch over to synthetic. i bet half of all the people out there don't even know why they are using synthetic, they just hear some mumbo jumbo from jimmy joe backyard bumfuck mechanic and think that whatever comes out of his mouth is the real deal.