Quote:
Originally Posted by Hanomag
Does anyone know where the oil pickup is for these engines (front, middle, rear of oil pan)? I am wondering if parking the car nose down nose up on a slight incline like a driveway would be better, worse, maybe not affect the startup oiling issue? Is the issue really an issue if 5w 40 syn and warm up times are allotted? Does it mater how we park these old oil burners?
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The issue's not an issue unless your motor has it -- only some of them do. I wouldn't necessarily call it inherent -- certainly something that *can* happen as these age, but not something that *will* happen. As far as I recall it wasn't an issue with yours.
Even on motors that do have the delayed oil psi syndrome, I have yet to see one have any identifiable real effect as a result of it, including in cases where they have been running this way every day for many years. Of my own 3 D24T cars, two make immediate pressure after startup and the other one takes quite a while. Doesn't seem to matter. The slow one has been doing it as long as I have had it, which is 30k miles, and probably was doing it a long time before that. I think the cam and the turbo would be the first things to suffer, and no issues thus far. I'm careful not to put my foot into it until the light goes out, and try to keep the oil level up since that seems to help; otherwise, I ignore it.
I have pictures of some oil pumps I had apart last year where I was seeing some relief piston wear that I think might be responsible for this in cases where it occurs -- no empirical data since I wasn't able to run those motors, but that's the best explanation I can think of. As to what causes that, I don't know; my guess is that Volvo's original service recommendation of conventional 15W40 oil, changed every 7500 miles, with filter changes only every 15,000 miles (!) probably meant that towards the end of the filter's life, on cold mornings with 15-40 in the sump, the filter was bypassing a fair amount of the time and lubrication was not so good.