Hey addguy !
Originally Posted By: addyguy
On the last run, a TBN of 8 is close to the virgin oil TBN
Well,
relatively close I guess - Mobil lists the TBN as 11.3 here:
Mobil 1 0w40
Quote:
I'd bet you could get 30k mile OCI's on this set-up.
Actually, it's looking more like at least 35K ....
ossibly much more .... grin: ..... (see attached report)
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Well done.
Thanks - I'm very happy thus far.
I've managed to rack up another 10K miles since my last analysis in early December and the engine oil has not been changed for 25K miles .... that made me sorta nervous, never having done this before .... so last night after I delivered my load in San Antonio, I pulled a sample and Fedex'ed it overnight to Blackstone.
This afternoon I got the analysis back and I'm breathing a little easier. The report was a good one, with nothing out of the ordinary ..... Blackstone says run it another 10K miles and check it again. My guess is they might be prone to err on the conservative side, so I might able to run it even further.
At any rate, while the tests cost something (and possibly make it closer to a wash economically) they are helping me to develop a statistical history as to how quick the oil degrades with my setup. At some point, I will decrease the frequency of the testing - perhaps the next time I completely change out the oil I won't initially test until 35K miles or so into the oil change.
Another thing I am contemplating is adding an Amsoil EaBP spin-on as a prefilter to the Motor Guard bypass. This would do several things.
1. Increase the sump size by at least a quart (up to four quarts for the big EaBP)
2. Reduce the frequency of the toilet paper element changes, thereby
3. Lessening the amount of make-up oil needed over the life of an oil change.
(Note: the 5 1/4 quarts of make up added
since the last full oil change on the current analysis
includes the 3 quarts previously mentioned in the prior analysis)