Please use the oil that the cam maker requires. If Howard's, it'll be Brad Penn or equal.
That is bad advice for a couple of reasons.
1. Just because a Company sells flat tappet cams and lifters, does not mean they know the first thing about what motor oil should be used. They are staffed by the same kind of people who have been brainwashed to believe that high zinc oil is all you need. They don't even know, what they don't know, which is that the whole idea of that thinking, is a total myth that has been busted big time. The fact is, some high zinc oils are good, and some high zinc oils are not. But, they don't even know that, so they often recommend oils that have been involved with oil related failures that they chock up to, "sometimes, things just happen". Well, things don't "just happen", they happen for a reason. And every time I've come across a flat tappet engine failure on a Forum, it always involves oils that performed poorly in my Engineering tests on motor oil.
2. I've performed Engineering Wear Protection testing on over 170 different motor oils. And unfortunately, Brad Penn oils have always been among the poorest performers. I have nothing against Brad Penn at all, but I feel that people deserve to know the truth when it comes to protecting their engines. Because there continues to be a ton of bad information given out on Forums from people who mean well, but just don't know the facts. Every single oil I have ever tested, is of course tested exactly the same. And here's how Brad Penn oils ranked:
The Wear Protection reference categories are:
• Over 105,000 psi = INCREDIBLE wear protection
• 90,000 to 105,000 psi = OUTSTANDING wear protection
• 75,000 to 90,000 psi = GOOD wear protection
• 60,000 to 75,000 psi = MODEST wear protection
• Below 60,000 psi = UNDESIRABLE wear protection
The HIGHER the psi value, the BETTER the Wear Protection.
• 0W30 Brad Penn, Penn Grade 1, partial synthetic = 71,377 psi, ranked 126th out of 176 oils.
• 10W30 Brad Penn, Penn Grade 1, partial synthetic = 71,206 psi, ranked 128th out of 176 oils tested.
• 10W40 Brad Penn, Penn Grade 1, partial synthetic = 57,864 psi, ranked 164th out of 176 oils tested.
• 30wt Brad Penn, Penn Grade 1, Break-In Oil, conventional = 56,020 psi, ranked 168th out of 176 oils tested.
That means that 125 other oils provided better wear protection than even the best Brad Penn oil. And not surprisingly, Brad Penn oils have been involved in a number of oil related engine failures, two of which are included in my Blog. So, you can see the details there, at the link below.
And while Royal Purple was the subject Break-In oil in this posting, here's how it performed:
• Royal Purple 10W30 Break-In Oil, conventional = 62,931 psi, ranked 154th out of 176 oils tested.
I recommend that flat tappet engines, especially high performance versions, use an oil that produces over 90,000 psi, to provide the best possible cam and lifter wear protection. One of these highly ranked oils should be used for Break-In and continue to be used after Break-In. The so-called Break-In oils are as a group, the worst performing oils I have ever tested.
The fact is, even cams and lifters that are only moderately hard, such as with less than ideal quality parts, can still live just fine as long as the oil being used prevents metal to metal contact. Once galling has begun, the parts are toast. The oil used absolutely makes all the difference.
Keep in mind that my test data exactly matches real world experience, making it the real deal, and the best motor oil reference information you can find anywhere.
For the truth about motor oil wear protection, that is not just opinion or theory, see my "TECH FACTS, NOT MYTHS" Blog, which now has over 150,000 views worldwide. You can see the Blog and my entire 170+ motor oil “Wear Protection Ranking List”, which is "proven" by the Physics and Chemistry involved, and EXACTLY matches real world severe over-heating experience, real world Track experience, real world flat tappet break-in experience, and real world High Performance Street experience (test data validation doesn’t get any better than this), along with additional motor oil tech FACTS, by going to the Blog link below. Credentials, methodology, proof, facts, data, Industry endorsements, real world validation, etc, are all included in the Blog. See for yourself, the engine you save may be your own.