Oil.... synthetic to conventional?
 

I've been using Royal Purple since 22 or 24k miles. I've noticed though, the I'm going through about a quart every 6-6500 miles. At the price of RP, plus the extra court, I could put conventional in it every 3-3500k and come out way ahead in the cost department.

I wanted to get some opinions first though. Is this OK to do?

Does your H2 blow through the oil? I've read it's a 6.0l vortec issue, so I'm guessing the answer is yes.

Re: Oil.... synthetic to conventional?
 

I've never had a leak so I rarely check my oil levels but have never had an issue with burning oil. I've always ran Mobil 1 in all my vehicles including the 2.

Typically it is not a problem to switch back to conventional or the other way around. Some will say to mix each oil (same weight) while some sources will say to just do a complete swap. Depends where you read the info.

Re: Oil.... synthetic to conventional?
 

You don't burn any oil? I don't have leaks, at all. But I do burn some oil.

If you put 6 quarts in with a new filter- after 5k miles you're dip stick still reads to the top dot???

Thanks for the other info....

Re: Oil.... synthetic to conventional?
 

I'll check it tonight. I'm only about halfway to my next change but I'll see what the stick reads.