Originally Posted by Mad_Hatter
Originally Posted by STIcandy
Just out of curiosity, what does the TBN look like @ 15k miles? With a fuel dilution >5%, I feel like the oil dropping a grade is only part of your problem. Not sure how much farther I'd push any oil regardless of viscosity. I'd consider engine longevity more cost effective then an extra oil change or two.
I'm all for doing UOA and seeing how well the oil is fairing and how far out you can push the OCI. As a matter of fact, being fairly new to the nerdy side of oil that's what I'm doing right now, however if you're ignoring what the results are telling you, doing them is moot.
My only other train of thought on this would be the filter. Of that 15K miles how long was it actually doing its job and how much longer could it? Call me old school, but although I've seen it talked about quite often, changing the filter and/or the oil wile not replacing the other sounds completely stupid to me.
My $0.02, run the grade it's spec'd for in your region for as long as the UOA says the TBN is >2 and it stays in grade and move on.
You're a thinker.ðŸ‘
Ignoring the +5% F/D is like me ignoring my Dr saying my blood tests show high cholesterol and I should lay off the fatty, fried foods...but instead I say, "Nah..I just need a little more fiber". 🤦
That's your opinion, zero issues in 85k miles with good UOA's I'm just wanting to bump up the viscosity a bit to better protect from the viscosity drop. I'm glad you had the time though for sharing a response.