Originally Posted By: dnewton3
Originally Posted By: RedCorvette
What's interesting is that the TBN suggests 8.5k would be the maximum. So he is getting 1k above recommended oci by using quality synthetic. I wonder whether dino would last the 7.5k.
TBN really seems to be something that reacts uniquely in each situation. For example, my 7.5k OCI with QSGB (dino oil at $2 qrt) had a TBN of 3.x after 7500 miles, and gave very low wear in my Fusion. Admittedly, my 2.5L four cyl is not the same as this engine, but it shows many dinos can go every bit of the OEM OCI and more. If it were not for warranty concerns, I'd do 9k mile OCIs on dino in a heartbeat in my car.
I often come off as being anti-synthetic; that's simply not true. But I am anti-waste, in any form. This is a good UOA; that's true, and I do not mean to take away from the good numbers. But I'd be interested to see how a high quality dino such as Mobil Super, QS, Valvoline, PZYB, etc would do? I suspect it would suprise many folks to see that the wear would be well in control, and perform similarly for a lot less cost. If the PP here is nearly maxed out around 8-9k miles for the OCI, could dino do (nearly) as well? I'd like to see!
As much as i believe that dino oils are good and can do their job well in a variety of engines, this particular case is different and here's why...
PP is blended to be stronger then PYB, for example.
If PP is almost done @ 8-9k, i highly doubt a cheaper dino oil would stand a chance in this engine @ the same interval. It's a cheaper, weaker oil and "technically" should be toast a few thousand miles sooner in this particular situation.
Just my