what oil to runnnnnn...

[papa-bach-racing]

i was told 20w-50 buy one person and then another told me 10w-30 not sure what to doooo....
can everyone help lol what oil do you run in a street/race car mid compresion

 

[Sean]

What kind of motor ? Clearances etc ? what is the intended use ? Selecting a oil grade has many many facets which are not always easily understood.