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Re: Oil recommendations for old car [Re: Linctex] #5048514 03/20/19 12:37 AM
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CR94 Offline
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Originally Posted by Linctex
... But this car has very, very, very, very weak pressure valve springs
Valve springs exert force, not pressure.


2011 Toyota Prius now at 104K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Oil recommendations for old car [Re: chromedome] #5048515 03/20/19 12:37 AM
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10W30 or 40 grade of choice.


make the inside of your engine oil cap white.
don't use.
Re: Oil recommendations for old car [Re: Chris142] #5048519 03/20/19 12:52 AM
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SnowDrifter Offline
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Originally Posted by Chris142
Originally Posted by SnowDrifter
Why y'all suggesting straight grade? 5w30 mo' betta than SAE 30

I know that it sounds weird but they seem " happier" with straight oils. Thats what they were designed for.

My 1957 case tractor does not "sound" good with multi weight oils. It has better oil pressure with sae30 than it had with 15w-40.

Indeed that does sound a little odd. Do you have any theories as to why? I don't oft touch old stuff so I'm genuinely interested in a discussion about it.

My impression of the recommendation of SAE 30 is this: Multi grade oils weren't far enough along in their development process and the VIIs used suffered from shear down, hence the decision to stick with a straight weight. Much like how we transitioned from 10w30 to 5w30 as the tech improved.

Do you happen to know the oil temps involved? I'm curious if there's an oddity where the straight weight was a fair bit thicker than multi grade on account of lower oil temps


2005 Tahoe - 140k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: Oil recommendations for old car [Re: das_peikko] #5048524 03/20/19 12:59 AM
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Originally Posted by das_peikko
Chevron SAE 30 and a bottle of Justice Brothers ZDDP additive for the camshaft and lifters.

[Linked Image]



The advice to add a 3rd party chemical in the case of this engine designed in 1951 is just bunk.


make the inside of your engine oil cap white.
don't use.
Re: Oil recommendations for old car [Re: PPWarrior] #5048527 03/20/19 01:33 AM
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OilUzer Offline
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Originally Posted by PPWarrior
Never use SOPUS (Shell, Penn, Quaker) its been proven that the wax forms at the bottom of the oil pan. Even here some users posted pictures of PPU bottles plugged with wax.

Just so that you can make a better informed decision.


There were some rumors decades ago but nothing new. Even then I don't know how true it was since I used to used dino Pennzoil in very cold winters and never had an issue.

recently, I put PP and couple other non sopus top of the line syn and dino oils in the freezer (-2°F) for a week and the only oil that looked as clear as it was at the room temp was the PP. The rest looked foggy (waxy? idk). Maybe it was moisture ... but whatever it was did not impact PP.
fyi, I'm still using both of the waxy looking oils in addition to PP so I'm not concerned but kind of impressed with PP.

Re: Oil recommendations for old car [Re: PPWarrior] #5048563 03/20/19 04:03 AM
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Garak Offline
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Originally Posted by PPWarrior
Never use SOPUS (Shell, Penn, Quaker) its been proven that the wax forms at the bottom of the oil pan. Even here some users posted pictures of PPU bottles plugged with wax.

Proven, eh? What a load of rubbish.

To the original poster, in addition to the suggestions of an SAE 30, a 10w-30 HDEO would also be very suitable. I wouldn't stress overly about ZDDP content in an engine of this vintage, but the elevated HTHS of a 10w-30 HDEO will be similar to that of an SAE 30.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Oil recommendations for old car [Re: chromedome] #5048617 03/20/19 06:21 AM
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Your engine was probably spec'd for 30w. A 10w30 or 10w40 should work fine with caveats. An API SN would be fine but I would stay away from an Energy (or Resource Conserving) oil. That means no "Starburst" or ILSAC rated oil. An ACEA A3/B3 or A3/B4 or High Mileage oil is where you will find this. Personally, I would pick M1 HM 10w30 or 10w40 (ACEA A3/B3, HTHS > 3.5). No need for a ZDDP additive (or any other additive).

Last edited by ka9mnx; 03/20/19 06:23 AM.

2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Oil recommendations for old car [Re: Chris142] #5048753 03/20/19 09:21 AM
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zrxkawboy Offline
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Originally Posted by Chris142

Do these have oil pressure fed rods or dippers?

pressure fed


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Oil recommendations for old car [Re: chromedome] #5048766 03/20/19 09:26 AM
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I agree with a straight grade SAE 30. Use a conventional oil. As a member stated above, these engines love a straight 30 grade. Don’t put any additives in it.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Oil recommendations for old car [Re: chromedome] #5048836 03/20/19 10:46 AM
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I also suggest a peek into the owners' manual, if one can be found for this Plymouth. If it runs good and no oil burning or major oil control issues, I would use a conventional 10w40... possibly 20w50 if ambient temps stay above 40F.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
2003 Honda XR400R
Re: Oil recommendations for old car [Re: chromedome] #5048887 03/20/19 11:34 AM
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I use 10w40 Super Tech in my 69 Pontiac. Cheap and it seems to like it.


My garage.....2012 Toyota Highlander (wife's), 2016 Ford 2.7EB F150(mine), 1969 Pontiac GTO, 2005 Double cab Tundra(son), 2015 Honda Accord EX(son).
Re: Oil recommendations for old car [Re: DavidJones] #5048999 03/20/19 01:16 PM
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chromedome Offline OP
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Well, after all the various opinions and many different suggestions, i think I'll be going with Rotella T4. Either 10W-30 or 15W- 40.
I have used T1 and then T4 in every motorcycle I have owned. Never disappointed.
I know that means nothing in an old car...but I think Rotella fits the purpose and at least I have positive experience with it.


2014 Toyota Camry
2012 Volvo S60
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Re: Oil recommendations for old car [Re: chromedome] #5049049 03/20/19 02:00 PM
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Originally Posted by chromedome
Well, after all the various opinions and many different suggestions, i think I'll be going with Rotella T4. Either 10W-30 or 15W- 40.
I have used T1 and then T4 in every motorcycle I have owned. Never disappointed.
I know that means nothing in an old car...but I think Rotella fits the purpose and at least I have positive experience with it.



That will work

Re: Oil recommendations for old car [Re: chromedome] #5049203 03/20/19 05:37 PM
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Originally Posted by chromedome
What oil would you gents recommend for a 1951 P!ymouth.
It has 53k miles. Motor never opened up.
I live on the NH/ME border. Car will only be run Mid- April thru end of Oct.

Many thanks


Lots of suggestions so far, most of which I agree with. Nothing wrong with a good SAE 30, or HDEO 10W30 or SAE 30 like Rotella, it's easy to find and at a good price. 15w40 in any reputable brand is also a good option. No additives needed. If oil pressure is low on 30 or 10w30 try 15w40, if still low try 20w50. I'd stay away from synthetics in it and keep the change interval short in the beginning as the oil may loosen up years of gunk. Depending on yearly mileage an annual oil change is probably sufficient.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
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