Originally Posted by CoupesCuts
Or is there another option?
Sure there is. Just take some 50 hour oil and have it tested. Blackstone Labs will do it for around $20. That may seem like a lot but the number of oil changes you'll stop doing unnecessarly will more than pay for the test. You can't look at oil and see if it's contaminated beyond it's abilty to hold more "garbage" or whether the additives and oil are worn out.