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Old 02-11-2023, 03:07 PM   #1
Bus Nut
Join Date: Aug 2020
Location: Alabama
Posts: 336
Year: 1996
Coachwork: BlueBird
Chassis: International 3800
Engine: DT 466 Mech. Spicer 5 speed
Rated Cap: 34
DT466 Normal Oil pressure?

Just curious as to what normal oil pressures are for an older DT466?

Mine happens to be a 1996 Mechanical with the "standard from the factory" mechanical oil pressure gauge in the instrument panel. 183000 miles and 8900 hours shown on the instrument panel.

Fresh oil change--
Cold start, ambient temperature 48 degrees F-- 55 Psi at idle.
After fully warmed up -- at idle-- 30 Psi.
Slightly revved up, and at highway speeds-- 53 to 55 Psi.

How does yours compare?

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Old 02-11-2023, 05:20 PM   #2
Bus Crazy
Drew Bru's Avatar
Join Date: May 2016
Location: Grayson County, VA
Posts: 1,435
Year: 1996
Coachwork: Amtran
Chassis: International
Engine: DT466
Rated Cap: 65
Ours is also a 1996. It seems to hang around 55 or so on the highway, more like around 50 at a high idle. I've been working on flushing the old coolant to change over to ELC so I've been running it at a high idle and watching the guages. I'll be changing the oil soon...curious to see if that affects the oil pressure or not.
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Old 02-11-2023, 06:02 PM   #3
Bus Crazy
ewo1's Avatar
Join Date: May 2015
Location: Central Tx.
Posts: 2,175
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
I have 2 busses.
, 1999 with 200k plus miles….50 psi cold idle, 40 when it warms up. 50 psi while driving.

My second bus, 2006 with a fresh inframe, less than 100 miles on it right now.
70 psi @cold idle, drops to 50 psi when warm, does about 60 psi while driving. This one has fresh oil, Rotella 15w40, and new filters and oil pump too.
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Old 02-12-2023, 07:02 AM   #4
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 19,141
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
my DTA360 when its Hot (180-190).. idles about 20-25 and runs 50-55 highway.. actually reaches 45-50 at about 1500 RPM..
thats running rotella T4 (plain ole oil) 15W40
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Old 02-12-2023, 05:55 PM   #5
Almost There
Join Date: Aug 2020
Location: Greensboro, NC
Posts: 95
Year: 2008
Coachwork: IC
Chassis: IC CE300
Engine: Maxxforce DT
Maxxforce DT, 220k, 55 psi idling wam or cold, 70 to 80 psi driving cold, 60 driving when warmed up.
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