As a general rule if one was to remove the oil filler cap on a 12v should one see smoke from it? On my 93 I dont recall any at all. my 95 does it somewhat, but none out the puke tube on the bottom . I have no smoke either to speak of or oil consumption. Should I be concerned??

 

Have a look at this thread.....there is directions by Infidel that tells how to build a blow-by tester:

https://www.dieseltruckresource.com/...mpression+test

 

What oil are you using? I had the same problem with Rotella-T. Changed to Delo and I don't have that problem anymore.

 

Rotella, usually use Delo though. Just bein a tightwad, its cheaper at wallyworld.

 

Same thing with me. Napa brand I believe is delo ( valvoline) and is cheaper.