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EFV-8 Club Forum / General Ford Discussion / Oil: Is 10w 40 Amsoil good to use in new flathead

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Discussion Topic: Oil: Is 10w 40 Amsoil good to use in new flathead -- page: 1 2

tnwoodie

11-16-2010 @ 7:00 AM

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Is Amsoil 10w 40 a good oil to use in flatheads?

trjford8

11-16-2010 @ 7:02 AM

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Amsoil is synthetic. I would tend not to use synthetic as it will find leaks. In a flathead you don't need any extra leaks.

supereal

11-16-2010 @ 8:44 AM

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If you are in a warmer climate, or mostly drive in the summer. 20w-50 is a better choice. It tends to give better oil pressure when hot, and protects wide clearance engines at higher speeds. Castrol make a good one.

Old Henry

11-16-2010 @ 3:47 PM

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Here is an older but very exhaustive discussion about various oils to use in flathead engines. It includes a great variety of opinions from reputable users as well as some nice scientific data about it. It's one of my favorites. http://www.btc-bci.com/~billben/oilwgt.htm When I read that kind of exhaustive discussion then step back, look up at the sky, and ponder, I reach the conclusion: "oil is oil is oil is oil." If it's slippery, put it in. No big deal.

As for me. I guess I'm more of a "truist" and run what Henry recommended - straight 30 weight.

Still Old Henry

P.S. I can tell you one thing for sure - I've never heard of anyone saying their engine failed because of having any particular brand or weight of oil in the engine, only from having no oil at all in the engine.

P.P.S. I do add ZDDPlus to all my oils (engine, tranny, diff, and steering box) since it's gone now from modern oils and is needed for our old flatheads.

This message was edited by Old Henry on 11-16-10 @ 5:15 PM

supereal

11-17-2010 @ 9:02 AM

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Opinions on oil are as numerous as there are owners. Today's oils are vastly superior to those available at the time the cars were built. At our shop, we recommend against synthetics, as they tend to leak past the primitive seals, and are not designed for engines with comparatively wide bearing clearances. As for zinc (ZDDP), it is vital in engines with valve systems using very strong springs, but not so much in flatheads. Mostly, the zinc protects the lifter face during breakin, but is not critical after that phase when wear patterns have been established. For the most part, fuel and oil additives do an excellent job of producing a thinner wallet. Positive reviews tend to be financed and published by those with something to sell.

Old Henry

11-17-2010 @ 9:39 AM

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Here's what "Big Daddy" Don Garlitis and others say about the need for ZDDP for your reading pleasure. Take it or leave it. I bought into it so use it all the time. http://www.zddplus.com/

Still Old Henry

supereal

11-17-2010 @ 10:47 AM

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My info came directly from a service bulletin from Fleet Maintenance in reply to a question about the need for zinc replacement in oil. Garlits is a legendary drag racer, but is also an investor in such products, and often is a paid endorser. Using ZDDP additives probably won't hurt, but appears to be questionable past break in. It was reduced in motor oil to prevent damage to the exhaust cat converters. We heard lots about how removing lead from gas would cause severe valve problems, and lead additives were heavily promoted. When no problems developed, the next big thing was zinc. All name brand oils contain excellent additive "packages", and putting in other compounds may dilute their effect. That is why "moly" products disappeared when experience showed not only few benefits, but increased wear when added in excess amounts.

Old Henry

11-17-2010 @ 6:01 PM

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Just trying to learn here.
Supereal, was the Fleet Maintenance Bullitin that you refer to and the question that it was resonding to a recent one regarding modern engines or was it one specifically for flatheads?

Still Old Henry

jerry.grayson

11-17-2010 @ 6:57 PM

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Just "askin"----Did the oil used in 1940 contain ZDDP?

Old Henry

11-17-2010 @ 8:08 PM

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Yes. It was an additive to protect the flat tappet cams and lifters. It's existence then and demise since is explained by the ZDDPlus web site here: http://www.zddplus.com/

Still Old Henry

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