Quote:
Originally Posted by FRFNUGN
Can I ask why you think it isn't wise? I had TBN done on the previous interval and the comment from Blackstone was "A TBN of 5.3 is showing lots of active additive remaining in the oil." If you're saying in regards to iron levels being high, I'd say that's due to the lighter oil itself (when I switched to 0W-40 it went from ~10ppm to ~25ppm). If I went with a shorter interval, I'd say iron would still be there, but at a lower number, simply because it increases linearly during the oil interval.
I do agree that 0W-40 doesn't seem to be the best in terms of iron wear compared to 10W-60. I may end up going back to 10W-60 at some point this summer and running that through the winter again to see if the values go back to what they were before the 0W-40 switch.
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Even the TWS at higher intervals seems to "thin out" and the iron climbs, so with 0w-40 already a thinner oil, extending the interval seems like a step in the wrong direction with respect to engine wear.