Thanks for the encouragement jag/overkill/jltd, appreciated. When I'm wrong I'm sure I'll get hammered, but the reader is owed the truth & diff opinions.
Originally Posted by Ducked
Those graphs, and your comment, seem to imply that the pattern of TBN decline is vehicle, rather than oil, specific.Why would that be? If it is, it is, but I'd have thought it'd be mostly the other way around
You're right, it's mostly the style of driving cycles, like hot/cold cycle times, highway driving, stop-n-go, etc. that influences oil life. Various engine types are different too, like sump size, oil cooling circuits, you know. .....All factors. .... "Vehicle A" in the graphs probably had different driving cycles than B or C there, and I'm just guessing that "A" was the most similar to the FJ Cruise, just a guess. In any case, A, B, or C, all with different driving cycles and/or engines, all show TBN slowly decaying near the end of a the oil change interval.
Originally Posted by Ducked
Those graphs, and your comment, seem to imply that the pattern of TBN decline is vehicle, rather than oil, specific.Why would that be? If it is, it is, but I'd have thought it'd be mostly the other way around
You're right, it's mostly the style of driving cycles, like hot/cold cycle times, highway driving, stop-n-go, etc. that influences oil life. Various engine types are different too, like sump size, oil cooling circuits, you know. .....All factors. .... "Vehicle A" in the graphs probably had different driving cycles than B or C there, and I'm just guessing that "A" was the most similar to the FJ Cruise, just a guess. In any case, A, B, or C, all with different driving cycles and/or engines, all show TBN slowly decaying near the end of a the oil change interval.
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