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Rebuilt 454 in motorhome, oil weight #4452689
07/07/17 08:00 PM
07/07/17 08:00 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
I think i know the answer to this. But I'm curios what you all think.

If you had a 454 with 40k on the engine, would you stay with 15w40?


The guage shows 30 psi oil pressure @ idle hot and 45/50 down the road


Supertech Junky
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452698
07/07/17 08:06 PM
07/07/17 08:06 PM
Joined: Mar 2013
Posts: 4,756
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,756
The Midwest
10W30. Your engine oil temp will run cooler than a 15W40 would on a hot Arizona day.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452710
07/07/17 08:11 PM
07/07/17 08:11 PM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Online content
BrocLuno  Online Content
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
Maybe, maybe not. Yes, there is some liquid friction in the bearings. But if the sump is hot enough, the 40 has thinned down pretty well anyway ...

The answer to this question lies in what the bearing clearances were set at when the rebuild was done? If the rods and mains are at 0.002" I'd run Chevron Delo 15W-30 SD (severe duty) with annual changes. If the rods and mains are 0.0025 to 0.003 or 4, then 15W-40 is your friend and it will not be happy on 30 ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452711
07/07/17 08:11 PM
07/07/17 08:11 PM
Joined: Jun 2017
Posts: 147
Waco, Tx.
Syntheticuser Offline
Syntheticuser  Offline
Joined: Jun 2017
Posts: 147
Waco, Tx.
In Arizona, you aren't hurting a thing. Many BB Chevys seem to do better in terms of consumption on thicker oil. A motor home, class A by chance? It would be working hard if it was. If you would care to, run a synthetic to handle the heat better. I have hauled with many BB Chevy 496 and
454s. They ran hot, some super hot. 235* or less is normal for a working BBC used in hot weather.
What's the builder say?

Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452725
07/07/17 08:28 PM
07/07/17 08:28 PM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
Mobil 1 high mileage 10w40


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452734
07/07/17 08:34 PM
07/07/17 08:34 PM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
I'd run a syn blend or better - I use Schaeffer's 7000 10w30 in my 454. It's not in a motorhome, but based on how much more limber mine was when I switched from 15w40 to 10w30 (same brand and type) I'd use a stout 10w30 if possible. 15w40 won't hurt it, especially in your climate, but I think there are 10w30's that will protect plenty well and save some power and fuel.


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: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452743
07/07/17 08:45 PM
07/07/17 08:45 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
So a full synthetic 10w30 would run cooler then a 15w40?

I have no idea how many miles are on this cycle. An oil change is in the near future.

The rv is in great condition motor wise. I mean, the guy was driving it 4 hours away to go camping....

Last edited by leroyd92; 07/07/17 08:50 PM.

Supertech Junky
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452748
07/07/17 08:48 PM
07/07/17 08:48 PM
Joined: May 2010
Posts: 9,045
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,045
North Carolina
If he does not know the main and rod clearances, could he use the oil pressure gauge as a guide? Try some 10w 30 and watch the pressure as it warms up, stopping to check pressure idle pressure at various stages of heating up. If the pressure drops too low at idle dump and go with the 40wt.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452760
07/07/17 08:57 PM
07/07/17 08:57 PM
Joined: Feb 2008
Posts: 1,102
PA
umungus1122 Offline
umungus1122  Offline
Joined: Feb 2008
Posts: 1,102
PA
M1 0w-40, 10w-40HM, Castrol 0w-40, Synthetic 5w-40 HDEOs


'95 Chevy 1/2t 305 205k -NexGen Maxlife 5w-30, Wix filter
'89 Jeep Comanche 4.0 278k - GC 0w-30, Bosch LongLife filter
Re: Rebuilt 454 in motorhome, oil weight [Re: spasm3] #4452762
07/07/17 08:58 PM
07/07/17 08:58 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: spasm3
If he does not know the main and rod clearances, could he use the oil pressure gauge as a guide? Try some 10w 30 and watch the pressure as it warms up, stopping to check pressure idle pressure at various stages of heating up. If the pressure drops too low at idle dump and go with the 40wt.
.

That's how I would go about gauging what weight oil an engine likes/will tolerate. If idle pressure is at least 25 at a good hot idle, with a high quality 10w30, and the engine isn't making a racket, no reason to think it needs a thicker oil.


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: Rebuilt 454 in motorhome, oil weight [Re: BrocLuno] #4452780
07/07/17 09:13 PM
07/07/17 09:13 PM
Joined: Mar 2007
Posts: 892
canada
hemitom Offline
hemitom  Offline
Joined: Mar 2007
Posts: 892
canada
I agree with brocLuno!! the 15w30 would be a good oil to try first..


2006 kia spectra.
2010 pontiac vibe.
2012 mustang coupe.
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452790
07/07/17 09:15 PM
07/07/17 09:15 PM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline
Joined: Apr 2017
Posts: 515
Fort Worth TX
Synthetic HDEO 5w40 such as rt6 or m1tdt


2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452844
07/07/17 09:49 PM
07/07/17 09:49 PM
Joined: Oct 2014
Posts: 11,821
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,821
Idaho
Some kind of 40 wt.


"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452868
07/07/17 10:17 PM
07/07/17 10:17 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
I'm going to check the oil level next time i make it to the house. Ill add 1 quart of marvel mystery oil to it ( if it's low ) and I'll see how it does.


Supertech Junky
Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92] #4452996
07/08/17 03:18 AM
07/08/17 03:18 AM
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
MMO at 40k miles? Why?


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
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