I have used Amsoil Synthetic 10-40 for many years without any issues. It's formulated for flat tappet lifters. Here's a link; https://www.amsoil.com/shop/by-product/motor-oil/gasoline/premium-protection-10w-40-synthetic-motor-oil/?code=AMOQT-EA

Rono

  Ron Lane,  Meridian, ID

Read and copied Ted's directions and made a ph call, got a real helpfull gent on the ph and got schooled some more.
It looked like i may not have got sealer between the retainer and the block, the crank had been turned .020 but idon't think the seal area has been as it is a stand alone area on the crank so it wouldn't be ground at the same time,replaced with the 312 seal from Best and it looks to have sealed up I put a few miles on it this weekend at a show and all seems good,.
 I ended up going with 10/30 valveoline and put a can of the ZZDP in and called it good.

Thanks for all the help.

dello 400 is for diesel engines,with use low sulphur fuel.
. use a 10 30   oil from walmart. pens oil or valvoline are all good oils. they need no additives. i have copy of extensive oil tests and adding stuff is risky as there are chemicals that replace additives so 1 must know what oil has for additive before additional adetives are used. oil for diesel engines is looking for major failures.in flat tappet gas engines.
still say the rear seal retainer is a major cause of oil leaks.

I've always had a concern about diesel oil detergents being too harsh for a gas engine over the long term. I use the Valvoline 10-40 also.

I used the same oil but Ted keeps warning that the newest configuration eats up bearings (or something like that) so I'm switching to Valvoline 10-40 which Ted Eaton uses in his engines.  He doesn't say that he uses any type of zinc additive.

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54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

.Good advice -  I looked up Castro GTX 20-50 and the data sheets didn't show ZDDP or zinc.  I called their tech line and the lady answering refused to  give me the info on either one.




54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Shell Rotella 15W40 which still  has sufficient Zinc in it to not require additional added. That's what I have been told and that's what I use.

  

The retainer should have studs and the threads need thread sealer.

You will get all sorts of answers about oil so to keep it simple, just about any oil will do, with a little due diligence on your part.  If you use an oil with less than the suggested amount of zinc and phosphorous, either halve the oil change interval or use an additive.  If the oil already has adequate levels, do not add a zinc and phosphorous additive - more is not better.  You can usually find the product information sheet, which will tell you the amount of additives that are in the oil, on the manufacturer's website and if you can't find it there, you can email and ask for it.  Possibly the easiest thing to do is ask your favorite brand what they suggest.


Lawrenceville, GA

20w50


Hyvinkää, FI

Looks to be the seal with the flywheel cover off I have oil flinging off the back of the crank when running,I'll also see to the pan bolts on the retainer, this engine has about 200 miles on it and last seal change I went to Delo 400 15/40 and some Lucas Zinc plus, what are you guys using for oil, multi vis or a straight weight.