Being that on oil too. How about running 30w break in oil 100% of the time? Enough zinc? I only really have 4-5 months of drive time here in MN

1957 Fairlane

I wouldn't run break in oil all the time. Too much zddp is about as bad as too little. A normal single viscosity like 30w should have just what you need.


Lawrenceville, GA

What would you consider as too much?

I don't have a number. If anyone here knows, it's Ted. As a general rule, any dual viscosity 40 or higher (10w40, 20w50, etc) and any single viscosity is already sufficient. I wouldn't add anything to it. If you use a dual viscosity 30 and lower (10w30, 5w20, etc) you will need an additive. If there is ever any doubt about an oil, ask the manufacturer which of their oils they recommend for a flat tappet engine.


Lawrenceville, GA

Ceck this sight Speed talk. diesel lube oil wear test results.this test includes gas engine oils.some quotes 5-20castrol gtx conventional
95543psi thresh hold
castrol edge titaniam 95717 5W30
818 ppmzink
phos 883ppm
moley 90ppm
titanium44ppm
thay also saymodern low zink oilsCAN BE USED SAFELY WITHFLAT TAPPETCAMS,EVEN WITH ENGINES WITH RADICAL CAMS AND SPRING PRESSURE. THER IS SOME 30 PAGES OF TESTS OF ALL OILS AVAIL IN THE US. THOSE WITH HIGH OILPRESURE,100PSI WOULD BE WISE TO CONSIDER5W30. IN TODAYS OILS THER IS NO NEED FOR HIGH OIL PRESSURE.1 COLD MORNIG YOU WILLBLOW THE SEAL ON MOST SPINONS,AS WELL AS THE GASKET ON THE ADAPTOR FOR THE SPIN ON

The high end amount of zinc in the oil for a daily driver is around 1350 ppm. Running much more than this for extended periods of time contributes to what is called ‘zinc overloading’ which then leads to pitting of the camshaft lobes.

Lorena, Texas (South of Waco)

If any one would like to read acouple of intro pages on lab and wear tests send me your email and i will send some intro info that will wet your interest. ct1940@shaw.ca att cliff