Oil Analysis
Cargo Master
Joined: Aug 2009
Posts: 2,137
Likes: 13
From: Glendive, MT
Most retailers/sales reps are not aware of how hard the HEIU injection system in the 7.3L is on oil. Like Pete posted, you will see the viscosity drop in most 7.3L applications before 10,000, in the 6,0L's it's before 5,000. Not nocking the oil, just don't run it for 20K like the advertisement says - the ICP of 3,000+ psi shears the oil over time. Me personally, I would not run an oil in a 7.3L over 5K without doing a used oil analysis and getting some historical results so you know for sure what is going on.
Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
Good advice, Rich. Like you've said, I went my first run with the 9000 series, like you already know, for 13K miles. I've slowly crept up to where I am based on the good results I'm seeing. I have to also add that I am not pushing my truck at all and I virtually never tow anything (except my own big self). Furthermore, just in the past week I've discovered some things that are making me suspect that my HPOP is getting a little tired and may not be working as hard as it could be, which could easily be part of why my oil is doing well at the higher mileage runs between changes.
Thread
Thread Starter
Forum
Replies
Last Post
TallPaul
Oil & Lubrication
1
Apr 1, 2004 09:17 AM
horsepuller
Oil & Lubrication
5
Jul 16, 2003 01:05 PM
