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I have been used Brad Penn's racing oil in my 68 Mustang with a 351c (flat tappet cam) motor but have been hearing that BP's Zinc and Phos numbers have been coming back from the various labs with low numbers. What oil is being recommended that has consistantly higher numbers of Zinc and Phos...

Can I assume that too much of anything is not good? So much jargon going on about our muscle car engines with flat tappet cams not having enough zinc and phosphorus, make me wonder if one can add too much additive to their oils bringing the numbers too high? What is the optimim zinc levels? I...

First as of now Brad Penn didn't have their new 15w40 out yet so I mixed equally some 10w30 and 20w50 to achieve 15w40. This was done after consulting with Brad Penn. Prior to the mix I had sent a sample of virgin 20w50 to Peterson Cat labs. Then I mixed the above numbers and put the 15w40 mix...

'65 Mustang coupe with mild cammed 302 engine- Use to run yellow death (Pennzoil) but after losing a cam, I have switched over to 15w40 Royal Purple. Engine is much quieter so I guess I should be happy with it? '67 GTO HO 400-Passed on from my late brother last year. The last oil introduced...

Per a given brand of automotive oil such as Mobil 1, Redline, etc, will the % of Zinc and Phosphorus change say from a 10w30 to a 20w50? If so is there an estimated percentage increase or decrease depending on which way you go? Or another way to ask it is, if one was to have a variety of...