Check out the "oil nerds thread" and also do some research on Bobistheoilguy.

But the short answer is, it's a hotly debated topic.

Amsoil

I like Bertolli. It lowers the engine's cholesterol.

i mix gasoline with the oil so i get more fuel in the cylinders

Since both of my feet are still firmly planted on the ground, I wouldn't know. Go back and read the original post - you can read it more than one way (that's why people need to be precise in what they write in posts on the Internet, like in this case stating "Owner's Manual" would have removed all ambiguity). On this topic, there've been some, uh, "interesting" posts, wouldn't you say - so it's entirely possible that he meant it the way I read it...

And my other point (Nissan's ester oil isn't synthetic) is also correct...

I read it just fine, but I appreciate your offer :tiphat:

I've found that a 1:1 mixture of Castrol GTX and toilet water makes the car run much smoother and quieter. Nastier the toilet water, better she runs. My Z is a dirty girl.

I'm running Amsoil's Signature Series 0W-30, but I'm considering moving to a 5W-40.

All of these are good, but I have seen enough UOAs that prove Royal Purple causes more wear on cars and doesn't like extended intervals.

Best to worse

Redline
Amsoil
Penzoil Ultra
Penzoil Plat
Castrol German
Mobil 1
Motul
Royal Purple
Castrol Syntec

Im using castrol edge.

Im sure you mean used toilet water, right? Number one and two combined.

yeah royal is not that good, so were theses UOAs specific to the 370 motor?

I am very happy with the 0w-30. I am switching between the 0w30 and the 5w30 right now but i am so happy with the gas mileage on the 0w30 im gonna stick with it year around