Oil zddp ?

Five ZDDP ZddPlus Anti-Wear Engine Oil Additive Zinc and Phosphorus Featured | eBay

Been using this stuff for many years....add it to a name brand 10w-30......I got many flat tappet motors running...Look at my signature...all flat tappet cams with 10w-30 and Dzzp...Or you can use the fancy oil named above....I just bought a box of 5 since I go thru a bit of oil....I add it directly into the 5 qt jug.....shake rattle and roll........