I've found that the 57K miles SRT-6 smokes some out of only the left side (not that I'd prefer it to be both sides). There is oily residue on the lower edge of both outlets.

I hear how bullet-proof these engines are, so assuming rings and/or valve guides - or a burnt valve would be doubtful. Or not?

It had passed smog (strict CA tests) so wondering why the smoke and oil?