What oil brand and weight are you using with hydraulic lifters in 258
A few months ago I replaced a bunch of things in the old 258 including the cam. After researching about breaking in the cam I learned that oils today do not carry the amount of zinc and phosphorus as was needed many years ago for flat tappet cams. I have been through 4 oil changes in the last 6 months and haven't used the same thing yet. I have used everything from royal purple racing to the Walmart conventional w/ comp cam break in additive. What does everyone suggest?