Originally Posted By: Paul2007
Hi dnewton,
I have enjoyed your posts since I've been on the board. I have a 7.3. I'd prefer to use up the LM 10W-40 all at once on a short OCI, but if necessary, I could blend. I really just want to use it up before it goes bad. I got it to use in the TDI, and the mower, but I won't use it up for four more years at the present rate.
It's your choice, but I wouldn't use it.
That's a great old engine; don't use CF rated fluids. Use one of the newer ones.
I realize you're probably in a situation where you're trying to use up the oil, but that would be a life's lesson perhaps; buying more than you can consume.
If you're dead set on using the oil, I'd use it in really short OCIs, such as 2.5k miles. And even then, I think you still risk some issues such as soot/insoluble control.
Perhaps you could sell it, or even give it away, to someone with a more appropriate use?