Looking for some advice regarding my Freightliner with low oil pressure

If I remember correctly, you cannot clear a “fatal historic event”, like low oil pressure, over temp over speed or the like. This means that the 4000 seconds are an accumulation, and not necessarily happened at one time.

 

Makes sense. It probably adds a second or two every time you start the engine.

 

Again if I’m not mistaken, DDEC III and above, will wait to record an “event” for 3 seconds. This is why when it shuts down, you can turn key switch off, wait, then restart it and it will take a few seconds for it to “recognize”, it has no oil pressure even if there is no oil in the engine. DDEC doesn’t record anything until it sees the engine is running. If it did, it would log low oil pressure if you left the KOEO. If you have a sensor bad, unplugged or what, I think it sees that and will throw a code after, 2 engine revolutions, 3 maybe?