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40 psi oil pressure in 454 with gtx 10w30 ? #4509157
09/06/17 02:56 PM
09/06/17 02:56 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
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 117f 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 100f @ midnight )

Should i stay with the 10w30? Or refill with 15w40 next service?


Supertech Junky
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509164
09/06/17 03:11 PM
09/06/17 03:11 PM
Joined: Jun 2012
Posts: 678
Reno, NV
redbone3 Offline
redbone3  Offline
Joined: Jun 2012
Posts: 678
Reno, NV
Rule of thumb: 10 PSIG for every 1000 RPM.


2014 Passat Wolfsburg, 1995 Miata.
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509165
09/06/17 03:16 PM
09/06/17 03:16 PM
Joined: Sep 2003
Posts: 3,132
Austin, Texas
Brons2 Offline
Brons2  Offline
Joined: Sep 2003
Posts: 3,132
Austin, Texas
40 psi at idle? that's pretty solid if you ask me.


2012 Hyundai Sonata GLS 6MT 2.4GDI, ProDS 10w30, XG9688 filter, 2018 Mitsubishi Outlander SEL 2.4 CVT, Factory fill still.
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509194
09/06/17 03:48 PM
09/06/17 03:48 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
I think the rv idles @ 800 rpm... So 50+psi idle cold. 35+psi hot


Supertech Junky
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509216
09/06/17 04:15 PM
09/06/17 04:15 PM
Joined: Mar 2008
Posts: 5,841
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,841
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.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30


Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509241
09/06/17 04:39 PM
09/06/17 04:39 PM
Joined: Dec 2016
Posts: 6,263
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,263
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509285
09/06/17 05:17 PM
09/06/17 05:17 PM
Joined: Jun 2003
Posts: 17,376
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,376
Deplorable in apple valley, ca
Why did you drive it with only 3.5 qts in it?


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509286
09/06/17 05:18 PM
09/06/17 05:18 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
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


Supertech Junky
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509387
09/06/17 07:05 PM
09/06/17 07:05 PM
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,868
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


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509399
09/06/17 07:27 PM
09/06/17 07:27 PM
Joined: Oct 2014
Posts: 11,857
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,857
Idaho
15W-40 in the BBC.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Chris142] #4509436
09/06/17 08:17 PM
09/06/17 08:17 PM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
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?

Last edited by Alex_V; 09/06/17 08:17 PM.

I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Chris142] #4509538
09/06/17 09:45 PM
09/06/17 09:45 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
Originally Posted By: Chris142
Why did you drive it with only 3.5 qts in it?


5.5 quarts.

7qt system


Supertech Junky
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4509555
09/06/17 10:03 PM
09/06/17 10:03 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
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.


Supertech Junky
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: Alex_V] #4509581
09/06/17 10:39 PM
09/06/17 10:39 PM
Joined: Dec 2016
Posts: 6,263
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,263
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."
Re: 40 psi oil pressure in 454 with gtx 10w30 ? [Re: leroyd92] #4510758
09/08/17 10:47 AM
09/08/17 10:47 AM
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
Ain't that the truth smile


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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