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#4509157 - 09/06/17 02:56 PM 40 psi oil pressure in 454 with gtx 10w30 ?
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
A few weeks ago i asked about oil for a rebuilt 454 motorhome engine.

A few days ago i found 3 quarts of 10w30 gtx hidden in the waste hose compartment.

I called my friend and asked him if he was was running 10w30 or 1540 in the rv and he said ( the white bottles of castrol )

So when we drove the rv home, it was 117°f and 1.5 quarts low. After the hour long stop n go drive, the oil psi ( 1983 dummy dash guage ) was roughly 40 psi.

Cold, its 55/60.(cold latley has been 100°f @ midnight )

Should i stay with the 10w30? Or refill with 15w40 next service?
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#4509164 - 09/06/17 03:11 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
redbone3 Offline


Registered: 06/09/12
Posts: 654
Loc: Reno, NV
Rule of thumb: 10 PSIG for every 1000 RPM.
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#4509165 - 09/06/17 03:16 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
Brons2 Offline


Registered: 09/16/03
Posts: 3042
Loc: Austin, Texas
40 psi at idle? that's pretty solid if you ask me.
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#4509194 - 09/06/17 03:48 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
I think the rv idles @ 800 rpm... So 50+psi idle cold. 35+psi hot
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#4509216 - 09/06/17 04:15 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
It likely has a high pressure and/or high volume oil pump.

Is it a flat tappet engine? If so I would DEFINITELY run Rotella 15w40.

Run Rotella 15w40 anyways for the next oil change and see how it performs.
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#4509241 - 09/06/17 04:39 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Judging from Virgin Oil analyses I see posed here, Castrol GTX isn't what it used to be.

I'd definitely stick with a good HDEO 15W-40 for that engine as usage. The 454 in my 1995 K3500 has 272,000 miles and has always been run on the cheapest 15W-40 I could find.
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#4509285 - 09/06/17 05:17 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Why did you drive it with only 3.5 qts in it?
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#4509286 - 09/06/17 05:18 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
I just figured a good syn 10w30 would free the motor up more.

I keep hearing/ reading horror stories about the cam wearing out due to heavy oil and the splash fed systems
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#4509387 - 09/06/17 07:05 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
BrocLuno Offline


Registered: 09/06/15
Posts: 5512
Loc: Kalifornia Kollective
OK, do we have any idea how old that GTX is ... Not because I'm worried it will go bad, but trying to get a handle on the add pak. If it's a few years old, it'll be fine until the next change.

35 psi hot idle is fine for that truck motor. As long as it comes up some when you rev it, it's all good. They need lots of oil, not lots of pressure. So HV pump is likely and if it'll make 50 psi going down the road, it's fine smile
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4509399 - 09/06/17 07:27 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
CT8 Offline


Registered: 10/09/14
Posts: 10946
Loc: Idaho
15W-40 in the BBC.
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#4509436 - 09/06/17 08:17 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Chris142]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
Originally Posted By: Chris142
Why did you drive it with only 3.5 qts in it?


Just to be accurate... that engine holds at least 6 qts., probably more considering the application.

"Flat tappet" isn't synonymous with Rotella or 15w40. If most all its running is going to be in warm or downright hot weather it certainly won't hurt it, but if you have 40 PSI hot idle oil pressure on 10w30 I'd bump up to a beefier 10w30 before I defaulted to 15w40. I moved from Schaeffer's 7000 15w40 to 10w30 in my '85 C3500 (flat tappet 454) a year and a half ago and that engine seems very happy with the change. You need all the power and as little parasitic drag as possible in that application, so if a stout 10w30 is more than adequate why waste the power of pumping a 15w40?


Edited by Alex_V (09/06/17 08:17 PM)
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#4509538 - 09/06/17 09:45 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Chris142]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
Originally Posted By: Chris142
Why did you drive it with only 3.5 qts in it?


5.5 quarts.

7qt system
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#4509555 - 09/06/17 10:03 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
The gtx is maybe 2 years old. the rv sat for 1 year. Friend changed it and took it camping 2 times before he parked it.
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#4509581 - 09/06/17 10:39 PM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Alex_V]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: Alex_V
You need all the power and as little parasitic drag as possible in that application, so if a stout 10w30 is more than adequate why waste the power of pumping a 15w40?


HAHAHAHAHAHAHAHAHA!

How much power do you really think is being lost?

Difference between 10W-30 and 15W-40 on the oil pump drive shaft
= WAY less than 1/4 HP difference!!!
(especially when hot, probably 1/20 hp difference)

Power has NEVER been a problem with my 454.
Gas mileage, on the other hand........
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4510758 - 09/08/17 10:47 AM Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92]
BrocLuno Offline


Registered: 09/06/15
Posts: 5512
Loc: Kalifornia Kollective
Ain't that the truth smile
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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