Yeah I figured, I was just wondering, with all the synthetics and blends. I use Mobil 1 and was just wondering. Well I just found this in a corvette forum:
Anyhow the results looked really good and both oils looked good after 4000 miles on each sample.. It was pretty much equal between both Mobil 1 and Royal purple.. I had the TBN done on both samples.. This test shows just how much life is left in the oil.. The higher the number, the more life you have in the active ingredients.. anything less than 2.0 means its time for an oil change.
The Mobil 1 5w-30 had a TBN of 3.9 at 4000 miles and Royal Purple had a TBN number of 2.6 after 4000 miles.. So what does this mean?? The Mobil 1 had more life left in it.. I could go to around 7000 miles on a change.. The DIC read 30% oil life remaining when I changed the oil at 4000 miles on both samples which is right on Par with the TBN number.. The Royal Purple had a lower TBN number than the Mobil 1.. So I suspect maybe 5000-6000 miles of total life from Royal Purple, before it goes under the 2.0 TBN number..
This post was edited on 2/28 at 3:17 am