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Old 07-28-2020, 04:01 PM   #1
Winnebago Owner
Join Date: Jul 2020
Posts: 139
2007 W24 8.1/6spd allison - what oil pressure ?

2nd owner 53k miles, was wondering what oil pressures most ppl have.

- @ start, idle in 50-70 degree weather - ~50 psi, if revved it goes a bit higher - ~10+.

- after running for 2 hrs - at idle - ~15-18 psi, would go to 30psi at touch of throttle.

btw, i use 5-30w synthetic.

I have the engine manual, it talks about 3-300 psi - which i suspect will never be seen at the sensor, these are supposedly absolute max/min, so completely useless figures.

Also, what do you monitor as you drive, Oil pressure or trip or what ?

in the constant up/down of 101 on oregon coast it is fun to see if you can EVER get into 6th gear !!

also another fun thing is to watch the instantaneous mpg - from 28 down to 3 !!!

also, why the H311 do we not have access to going into 4th w/o resorting to turning off OD, why not a - D, 4,3,2,1 pattern ???

auto is not necessarily smarter than a good driver !!!!!!

ps: i HATE grade assist, way too violent and guess what high revs are NOT so great for an engine - especially a NOT short stroke large 8.1 V-8 even with synthetic oil - personally i do not like to exceed 3500.

pps: I checked the 'events' (30sec duration events) part of allison monitor and I think that some prev driver got into a runaway situation, max rpm 6000 (fuel cutoff I suspect), max speed 81mph, sounds like someone had less brains and too much confidence in 'downhill assist' bs !!

ppps: brakes are MUCH CHEAPER than engines, always use brains over computer 'skills' !!!!!
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Old 10-11-2020, 01:23 PM   #2
Winnebago Owner
Join Date: Jul 2020
Posts: 139
wow, so no one ever monitors their oil pressure ?? how strange, it just might save your engine if you did - idiot lights are for _____!
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Old 10-16-2020, 11:45 PM   #3
Winnebago Owner
Join Date: May 2019
Location: Prescott, AZ
Posts: 85
I'll check it from time to time but for the most part the display is hard to see and there are usually many things to keep an eye on when driving a 39 foot motorhome with either my towd or 18' trailer. As a lifelong gearhead and mechanic my ears are tuned in to what I hear to let me know what may be happening underneath me.

My oil pressure is about 50 PSI on start-up and when warmed up it's 15 to 18 PSI at idle and around 35 PSI at cruising speed.
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