Looking for some advice regarding my Freightliner with low oil pressure

Well, according to FL's own service bulletin, there is no inspection of the lower end needed. if they are asking to do this as a precaution, that would not be a bad idea, but if they are refusing to replace it, well, call Freightliner customer service and tell them what's going on.

https://static.nhtsa.gov/odi/tsbs/2015/MC-10140833-9999.pdf

READ the steps and make sure they do them.

 

I don't get why they are refusing. At 800K miles it's not as if there is a warranty involved. They should just do what you pay them to do.

 

The standpipe can and will cause that kind of damage pretty fast it doesn't care how well you maintained it! That being said they should do as there told nothing more.

 

The 4000 seconds probably came off the computer. Your lights might be a delayed sign. Meaning you lost pressure before the lights. Maybe. I don't know how the system is designed.

Anytime you lose presssure. Damage is immediate. The crank being the closest to the pump will be first. The entire motor requires pump pressure. All the way to the top.

 

I would call Freightliner and complain, call customer service to see why they will not repair the truck.

I would also get a dump of the ECM to have them PROVE that the truck was run for 4000 seconds, which is 66 minutes of run time without oil.

do they think you are a moron?

 

I'd say there is about a 90% chance you need a bottom-end rebuild.

 

I know of a truck that got flopped over and was left running on its side. According to the dealer it ran for over 30 seconds on its side with 0 psi oil pressure before the engine protection system shut it down.

Like you said it might not have been an instantaneous shutdown as soon as the ECM detected lost oil pressure. The fact OP overrode the shutdown at least once I'd be leary about there not being at least some accelerated wear.

I would still ask them for a printout to confirm 4000 seconds of low oil pressure. That part doesn't add up to me.