Oil confusion

[ZiO]

Hi guys. I need some help.. I would realyl like to know th ediffrence between a XXW-30 synthetic oil and a XXW-50 synthetic oil. As far as i have looked, the XXW-50 seems to have a better flash point and viscosity index. BUT, i would like to know how to actually read these numbers.. for exmaple, i know a 5W-XX is a thinner oil than a 10W-XX, but i dont know what the other number means. I am assuming i am right in thinking it is just flash point numbers or something? someone help my confsed brain. THanks guys, i appreciate your input.

 

[Don]

This will answer many of your questions.

Don

 

[ZG77_OzZ]

I use synthetic oil

And I have seen and feel a diffrents.

 

[promp3]

I use 10w 30 syn but if u live up north its recomended to use 5w30 thats about all I know about oil