Oil Seperator
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Joined: Jun 2007
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From: Austin, TX
As the oil gets used more and more, it also becomes thinner. 3000 mile oil in my truck @ normal temp of ~190* will only hold ~2300psi ICP. Change the oil, get it up to temp and it will hold 2600-2700psi. 3000 miles later, I can only hold 2300psi again. I've done this time and time again and I can even feel the difference in power after changing my oil.
Posting Guru
Joined: Nov 2011
Posts: 1,664
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From: Southern AZ
T6 is about $22-$23/gal after tax (x4)
Motorcraft filter is ~$10
UOA at Blackstone $25 (Priceless)
So an oil change costs me about $125 but I only change it every 18 or so months so it's not bad.
Richard
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Joined: Sep 2003
Posts: 2,630
Likes: 217
From: North East Ohio
I like to protect my $3000 engine with a $50 oil change, not with a $35 oil analysis.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
Hotshot
Joined: Mar 2012
Posts: 10,590
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From: Texas
Byron, I've put A LOT of miles on this engine with the setup that I'm running on it. I can tell you this... My HPOP is not big enough for my injectors. If it were, then it wouldn't drop ICP at all. It is because of this though that I can notice when the oil is thicker or thinner. For example, when the oil is at 100*, it will hold 2900-3000psi ICP, but with the oil at 200*, I can only hold ~2700psi . Why is that? Easy.. The oil thins out as it gets hotter.
As the oil gets used more and more, it also becomes thinner. 3000 mile oil in my truck @ normal temp of ~190* will only hold ~2300psi ICP. Change the oil, get it up to temp and it will hold 2600-2700psi. 3000 miles later, I can only hold 2300psi again. I've done this time and time again and I can even feel the difference in power after changing my oil.
As the oil gets used more and more, it also becomes thinner. 3000 mile oil in my truck @ normal temp of ~190* will only hold ~2300psi ICP. Change the oil, get it up to temp and it will hold 2600-2700psi. 3000 miles later, I can only hold 2300psi again. I've done this time and time again and I can even feel the difference in power after changing my oil.
It will tell you fuel, TBN, and soot levels. That is pretty much the cleanliness and usability of your oil in a diesel.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
An oil change isn't information. A UOA will detect traces of coolant or fuel that you'd never find by any other means, but which, left unattended, could be costly. Not to say that a UOA is worthwhile with every oil change, but a baseline and an occasional re-test can tell you of things that can't be "fixed" with an oil change.
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