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#4452689 - 07/07/17 08:00 PM Rebuilt 454 in motorhome, oil weight
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: 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
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#4452698 - 07/07/17 08:06 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
skyactiv Offline


Registered: 03/02/13
Posts: 4391
Loc: The Midwest
10W30. Your engine oil temp will run cooler than a 15W40 would on a hot Arizona day.
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#4452710 - 07/07/17 08:11 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
BrocLuno Offline


Registered: 09/06/15
Posts: 5506
Loc: 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 ...
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#4452711 - 07/07/17 08:11 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
Syntheticuser Offline


Registered: 06/11/17
Posts: 147
Loc: 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?

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#4452725 - 07/07/17 08:28 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Mobil 1 high mileage 10w40
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2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

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#4452734 - 07/07/17 08:34 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: 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.
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I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
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#4452743 - 07/07/17 08:45 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: 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....


Edited by leroyd92 (07/07/17 08:50 PM)
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#4452748 - 07/07/17 08:48 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: 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.
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13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
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17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4452760 - 07/07/17 08:57 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
umungus1122 Offline


Registered: 02/12/08
Posts: 1057
Loc: PA
M1 0w-40, 10w-40HM, Castrol 0w-40, Synthetic 5w-40 HDEOs
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'95 Chevy 1/2t 305 205k -DuraBlend 5w-20, Puro Gold filter
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#4452762 - 07/07/17 08:58 PM Re: Rebuilt 454 in motorhome, oil weight [Re: spasm3]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: 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, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

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#4452780 - 07/07/17 09:13 PM Re: Rebuilt 454 in motorhome, oil weight [Re: BrocLuno]
hemitom Offline


Registered: 03/12/07
Posts: 882
Loc: canada
I agree with brocLuno!! the 15w30 would be a good oil to try first..
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2010 pontiac vibe.
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#4452790 - 07/07/17 09:15 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
TheKracken Offline


Registered: 04/18/17
Posts: 515
Loc: Fort Worth TX
Synthetic HDEO 5w40 such as rt6 or m1tdt
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2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
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#4452844 - 07/07/17 09:49 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
CT8 Offline


Registered: 10/09/14
Posts: 10922
Loc: Idaho
Some kind of 40 wt.
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#4452868 - 07/07/17 10:17 PM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: 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.
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#4452996 - 07/08/17 03:18 AM Re: Rebuilt 454 in motorhome, oil weight [Re: leroyd92]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
MMO at 40k miles? Why?
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07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
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