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EFV-8 Club Forum / General Ford Discussion / Oil weight choice.

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Discussion Topic: Oil weight choice. -- page: 1 2

Gary M.

11-13-2020 @ 5:16 PM

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Hi guys, I'm trying to figure out a good multi weight oil to use for my 39 V8 85 hp. I have no idea how many miles are on the car. The engine has never been rebuilt but runs well. There is a sticky valve that loosens up sometimes, and when it does, the car takes off like a rocket ! I am going to do a crankcase flush and change the oil to a multi weight oil. I live in NY ,so the temps are between high 90s in the summer and 20s in the winter. I usually only take the car out in 70s or 80s weather but occasionally I will participate a Christmas tree lighting ceremony. I'm wondering if I change to a lighter grade oil, will that help with the sticky valve. Presently I am using straight 40w mainly because I'm not sure how much wear there is on the engine.
What do you guys think ?
Thanks ......

bo8109b

11-13-2020 @ 5:58 PM

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With the unknowns that you have, I would use 20w50 (Any brand) and add about 4oz of marvel Mystery oil to both the gas tank and crankcase for that sticking valve. Then run it on the highway at various speeds as though you were breaking in the engine.

Gary M.

11-13-2020 @ 7:37 PM

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Wow, that's old school where I come from. Marvel is what I used on everything in the 70s. That stuff is liquid gold !! I'll go with your advice on the oil and the marvel and take it for a nice ride to loosen things up. Fingers crossed !!

mfirth

11-14-2020 @ 4:40 AM

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Time 2 on MMO and 20/50 !

alanwoodieman

11-14-2020 @ 5:14 AM

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Kendall 20w50 and MMO

sarahcecelia

11-14-2020 @ 5:27 AM

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I believe that the "BASE" of Marvel Mystery Oil" is Automatic Transmission fluid.

Ford " back in the day" used oil with ZINC in it To protect the camshaft lobes,and tappets. "All OIL" in that time had ZINC in it, but later the EPA made the oil companies take it out! Now "Valvoline 20/50 Racing oil" has ZINK in it, and I highly recommend using that in your "Flat Tappet"/camshaft car! The Zinc cushions and Protects the cam lobes and tappets!Any Flat Head motor guy "Worth his Salt" knows this. I once talked to Harold "Putt" Smith, (the Flathead Guru) about this very subject, and he agreed whole heartedly with what I said about oil with zinc for Flat Heads!!; and nobody knew more about them than he did!!He built his first flathead(for the neighbor acrross the street) when he was 12 years old!!!

Regards, Steve Lee

Gary M.

11-14-2020 @ 1:36 PM

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Thanks again guys for all your advice. Hopefully my sticky valve will loosen up and the car will run young again !!
Thanks, Gary ....

supereal

11-19-2020 @ 9:49 AM

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It is more than likely that your sticky valve will not be fixed by time and new oil . If you haven't already done a compression test to determine the affected cylinder(s), it should be done before anything else. To get access to the valve train, remove the intake manifold. Check the valve and spring for a buildup of deposits. Some times prying the valve stem up and down will free it up. be sure that the valve is in the closed position so it won't come in contact with the cylinder head as you pry. If you find the usual buildup of sludge in the bottom of the valve chamber, try to wipe as much as possible, but don't use solvent.

flatheadron

12-03-2020 @ 6:45 AM

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I use synthetic 10W30 oil in all my flatheads. Find one the is rated for older engines and that says it contains the zinc additive. Stay away from newer "SN" rated oils. Good flow on cold starts and good protection at high temps. I live in Michigan so weather is similar to yours. Have used this for 15 years now with no problems. Since a lot of members use Marvel Mystery Oil, I would suggest you try adding some to the gas to see if it will help free up that sticking valve. I used to know a guy back in the late '60's who sold MMO. He drove a '53 Merc as his daily transportation that a had a MMO kit on it that injected MMO into the intake. As a selling tool he would remove a spark plug to show the internal cylinder. They were as clean as if you had removed the head and physically cleaned the chambers. The stuff just might work. Would not take much to rig up a similar system using a jar, hose, vacuum fitting, and a carb jet. Might take some time to find the right size jet but it is worth a try.

kubes40

12-03-2020 @ 6:54 AM

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Kendall 20w50 and MMO

x2

Mike "Kube" Kubarth

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