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Old 06-30-2013, 10:42 AM   #21
keith oh
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Default Re: What should I use for oil in 40 Ford flathead?

The greatest amount of wear is in the first few seconds after start up. The faster oil gets to the moving parts of an engine the less wear. One reason Diesel engines last longer is because thier fuel is Oil and therefor are lubricated from startup. So it stands to reason thiner viscosity oil is desirable. If an engine has not been run for a while (a day or more) then leave the ignition off and turn it over for 10 or 15 seconds. Then after 20 or 30 seconds, to let the starter cool, start it. That is why I think installing a stand by Electric fuel pump, just to prime the engine for a quick start after setting for a while, is actually harmful.
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Old 06-30-2013, 11:24 AM   #22
VeryTangled
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Default Re: What should I use for oil in 40 Ford flathead?

Welcome to the Forums DP1743.

Those numbers are from the American Petroleum Institute's 'Service Classification' rating system. For starters, ratings beginning with C are for 'compression' engines, and S are for 'spark' engines, current production cars and trucks should take CH-4, CI-4 or CJ-4, or SJ, SL, SM, or SN. More in this .PDF: (don't recognize the .ashx extension, but it opens with Adobe Reader okay), http://api.org/oil-and-natural-gas-o...10_120210.ashx EDIT WRONG INFO: S=Service, C=Commercial as per the "Motor Oil Guide 2010."

It's a good question whether modern oil formulated for high compression, fuel injected, 200k mile engines, would be suitable for engines that originally used single grades not above SAE30 viscosity. As you can tell, there are quite a few perspectives.

-VT/Jeff

Last edited by VeryTangled; 06-30-2013 at 07:19 PM.
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Old 06-30-2013, 04:09 PM   #23
dp1743
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Default Re: What should I use for oil in 40 Ford flathead?

Hi Mike. Yup... I'll be posting some pics in the near future. Thanks for your advice. Dick
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Old 06-30-2013, 04:13 PM   #24
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Default Re: What should I use for oil in 40 Ford flathead?

Thanks to everyone for their advice and for making me feel welcome. When it comes to oil we all know it's the "life blood" of the car. Makes me wonder though, when I was young I used to put used oil in my 56 Chevy 6 cyl. It came in glass bottles with long metal necks and a lot of old service stations would sell it cheap. I would stop to fill up on oil and check the gas. That car last another couple of years before it gave out. - Dick
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Old 06-30-2013, 08:57 PM   #25
woodypecker
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Default Re: What should I use for oil in 40 Ford flathead?

SJ and CI have the most zinc but you can not find them anymore.
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Old 07-01-2013, 07:36 AM   #26
lenmissy
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Default Re: What should I use for oil in 40 Ford flathead?

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I use no. 40 oil.
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Old 07-01-2013, 11:41 AM   #27
tiger.1000
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Default Re: What should I use for oil in 40 Ford flathead?

In my Model B I use low detergent, SAE 30 but it ain't so hot in the UK
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Old 07-02-2013, 06:14 PM   #28
Merc Cruzer
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Default Re: What should I use for oil in 40 Ford flathead?

20/50 Castrol and a bottle of ZZDPlus
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