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At this point since I don't have anything on paper to prove my points I will just have to post my experiences. I own 11 flat tappet engines, 7 diesel and 4 gas. They are all as old or older than I am. I use conventional oils in some synthetics in others. These are all off the shelf oils, and...

I have read through some of that site before, and I did suffer from the same headaches. Although I have not been on that site in a while.

That bit about the friction modifiers not playing well together came from the Mobil rep I talked to and I had to pretty much trick him into telling me that. I don't think I could ever get them to write something like that down on paper. They seem to be pretty hush-hush about their stuff.

Many of the oil companies had to remove all the ZDDP from their oils so they could start using their new friction modifiers. Like I said the ZDDP and the newer friction modifiers don't play well together. You may have gone through this rodeo before, just as I have, but you also need to stay up...

The original poster began to ask about oil additives too.

I read through all the posts, and realized that some of what I said may have been confusing. I will try and explain with a little more depth. First my comment on Shell Rotella not being what it used to be. I was referring to that oils film strenth. It has decreased by more than 20,000 psi in...

Conventional oils have come a long way in the last fifteen years. They are closer to the performance level of the synthetics than most people believe. The only major advantage that the synthetics hold over the conventional oils now is extended drain intervals. If you change your oil every...

I order my oil from Napa. Part #NP75118 is an SAE-40 CF-2 oil for the 2-strokes. You should use CF-4 for the 4-strokes, but I can't remember the part number for that.

That oil has changed dramatically in the past two years, and unfortunately not for the better. It's not a bad oil, just not what it used to be. Oil companies change the chemical formulation of their oils all the time, so it's impossible to say that an oil that performed well last year will...

ZDDP additives are liquids that you pour into your engine. However ZDDP itself is a solid. So what are you actually pouring into your engine? Also I have built quite a few high performance diesel and gas engines with flat tappet lifters, and have witnessed cam lobes wiped out on engines that...

While I agree with the zinc-phosphorus issue I have to warn everyone that the zinc-phosphorus additives are not just zinc and phosphorus. Those are metals that are mixed with who knows what else. I have personally seen oil analysis and bearing wear tests that show how the introduction of these...