Oil Change interval based on time

Terryallan wrote:

msmith1199 wrote:

45Ricochet wrote:

luvlabs wrote:
Check what your engine manufacturer recommends. Cummins, for example, on their later engines has dropped the mileage requirement and just says once a year or every 16,000 miles. Easy to remember.

Yeah this is true but I sure don't know why Roger. I once got a test back from Blackstone and the comment stated " oil just doesn't go bad setting there". This was a base test and the Ram wasn't driven much that year.
I'll do it the first year and I should be pretty close to 12k this year but after that I'll just have in tested every spring.
They make a Fumoto drain for your oil pan OP. Really easy to pull a sample each year.
Fumoto Site

I've been told by more than one person that oil does go bad just sitting there. And these were experts in the field. I have no idea who to believe on that issue. The people who sell the oil say it goes bad, but that's because they want to sell you more oil.

So do you ever see WalMart, or Advance Auto rotate their oil stock??? No?? They just let it sit there until it is sold.

I've never monitored the oil on the shelf at Walmart or Advance Auto so I have no idea how long they let it sit. But I do know it's sitting in sealed containers and not subject to moisture or heat like once it's put into a engine. So it would seem to the fact that it may be able to sit while in a sealed container doesn't prove much.