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#4668134 - 02/16/18 06:49 PM What oil for a flathead Plymouth?
Chris142 Online   content


Registered: 06/05/03
Posts: 16814
Loc: Deplorable in apple valley, ca
Customer of mine bought a huge project. It's a WW2 Dodge Power wagon. It needs lots of help. Anyway I have ran the numbers on the engine and its a 230 from a 1956 Plymouth. It does not have any type of oil filter on it.

In my past we ran ND30 in engines that don't have an oil filter. I am in California and I can't get ND30 here.

Thoughts?
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#4668137 - 02/16/18 06:52 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
spasm3 Online   content


Registered: 05/30/10
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Rotella T1 30w or T3 10w 30
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#4668145 - 02/16/18 06:56 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
Ducked Offline


Registered: 10/25/12
Posts: 4328
Loc: Taiwan
Why ND?

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#4668148 - 02/16/18 06:57 PM Re: What oil for a flathead Plymouth? [Re: Ducked]
Chris142 Online   content


Registered: 06/05/03
Posts: 16814
Loc: Deplorable in apple valley, ca
Originally Posted By: Ducked
Why ND?
Some say that detergents will pick up the scrap and run it through the bearings.
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#4668153 - 02/16/18 06:59 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1657
Loc: Crawfordville FL
I know of one ND 30 and it is harbor freight compressor oil.

I would go with any SN rated 30 I can find by the jug. Most OPE doesn’t have oil filtration and the detergents in modern oil don’t bother them.

I wouldn’t go over 2k oci though


Edited by SilverFusion2010 (02/16/18 07:00 PM)
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#4668155 - 02/16/18 07:00 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
69Torino Online   content


Registered: 12/12/17
Posts: 235
Loc: Indy
Multi weight oil won't hurt it. I vote a stout 10W-30 such as Rotella or Valvoline VR-1 or any 15W-40 HD oil. My personal opinion is a 10W-30 will be beneficial with cranking speed when cold, (under say 72F) especially if it's still on 6 volts.
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#4668157 - 02/16/18 07:02 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
redbone3 Offline


Registered: 06/09/12
Posts: 654
Loc: Reno, NV
Clean out the oil pan, run either 10-30 or 20-50. If that engine lived on non detergent oil back in the day, and you put detergent oil in it there is a large possibility of the oil screen being blocked by debris.
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#4668159 - 02/16/18 07:04 PM Re: What oil for a flathead Plymouth? [Re: redbone3]
69Torino Online   content


Registered: 12/12/17
Posts: 235
Loc: Indy
Originally Posted By: redbone3
Clean out the oil pan, run either 10-30 or 20-50. If that engine lived on non detergent oil back in the day, and you put detergent oil in it there is a large possibility of the oil screen being blocked by debris.


Forgot to mention... put an oil pressure gauge on it. Either a diagnostic one or a permanent one. Just so you know it's there and steady.
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#4668168 - 02/16/18 07:10 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
PimTac Online   content


Registered: 03/04/17
Posts: 4232
Loc: Soviet State of Washington
You are going to have to find a source and smuggle it in thanks to California laws.
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#4668196 - 02/16/18 07:25 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
Plain ol 30. Nothing special. Don't you use a lot of Proline, from Pep Boys? Proline 30 for the win.
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#4668202 - 02/16/18 07:30 PM Re: What oil for a flathead Plymouth? [Re: Red91]
Chris142 Online   content


Registered: 06/05/03
Posts: 16814
Loc: Deplorable in apple valley, ca
Originally Posted By: Red91
Plain ol 30. Nothing special. Don't you use a lot of Proline, from Pep Boys? Proline 30 for the win.
ya I actually bought some sae30 for it but second guessed myself.. It has a mechanical gauge and it shows 40 psi. The bottom of the oil pan was a disaster. I have it soaking in solvent.
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#4668203 - 02/16/18 07:31 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
BrocLuno Offline


Registered: 09/06/15
Posts: 5508
Loc: Kalifornia Kollective
So what's the customer budget? Are we only trying to get it running? Or does the customer want it to run right ...

You could just put SAE 30 HD from Tractor Supply in there.

If it were mine or I was going to keep it running for somebody, I'd add a canister filter (they were optional on some early Chrysler products) and then run Delo 400 15W-30 SD (severe duty). The filter can be found on ebay or maybe just ordered through your local Napa store...

The engine does not need that oil per se, but the add pack is stout, and it's a very good oil with a narrow viscosity spread.

So have you had the tappet covers off? That is where you will see grunge if it's there.

I'll bet it needs a valve adjustment if it's been running unleaded... The exhaust valves may have receded some, tightening them up and loosing compression ... For the adjustment, I'd run them on the loose side of spec.

If the tappet boxes are pretty clean, it'll run multi-grade high detergent oil just fine smile

Any HDEO 15W-40 would be very good smile



Edited by BrocLuno (02/16/18 07:33 PM)
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#4668223 - 02/16/18 07:52 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
jhellwig Offline


Registered: 07/01/13
Posts: 1539
Loc: Ottumwa, Iowa
Just put a normal oil in it.
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#4668267 - 02/16/18 08:36 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
Eddie Offline


Registered: 12/07/03
Posts: 9559
Loc: Florida, Cape Coral
I vote for T5 10w30. I ran my flat heads of 1950s on 30 weight back in the day but, I'd go 10w30 today. ED
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#4668293 - 02/16/18 09:04 PM Re: What oil for a flathead Plymouth? [Re: Chris142]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1690
Loc: Alberta
Ask for non detergent 30 weight oil at your auto parts store. Most have it.


Edited by Snagglefoot (02/16/18 09:04 PM)

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