Also, Joe Gibbs has a 20W/50 racing dino oil that is loaded with the good stuff for lots less $ than their synthetics. --- Jer

Thanks.

To answer the initial question or post, yes I lost a cam lobe with an Ultradyne after about 125 hrs. I used Mobil 1, 15-40. This was a special problem with Ultradyne Cams for a while.

My question on the racing oils, are do they offer the qualites needed for extended oil change intervals? Are they high detergent so you don't have to change them every 5-10 hrs of operation? Oil change intervals are not an issue with racing engines, but for recreational performace boaters it is. Infact, this post is scaring me because I do not want to wipe out another flat tappet cam because of oil issues, but I don't want to have to change it every other time I go out either. Somebody help me out here!

500 miles at or above 9000 rpm is probably more abuse than most of us recreational boating guys submit our engines to in a given year. But if you think that you drive further and harder than that, you should change it once in mid-season. --- Jer

I'm talking about dirt and ability to deal with moisture. All the things that oils for consumer usage is designed to do. Of coarse I don't subject my boat to the equivalent of 500 miles at 9000 RPM smart ass.

I really wasn't trying to be "smart". I probably DO have a customer or two who will subject his equipment to comparible abuse in one season. Getting your oil temps up to 212* F should vaporize any moisture, (You should do this with any oil) and proper filtering should do the rest. I change my filters (I use a dual filter system) midway through the season and just top off. --- Jer

Thanks for the input. I bought the boat from the orig. owner he lost a cam in less than a year got it warr. had engine rebuilt. I bought it with two hours on it and it lived for ten more hours this time. Completely wiped out one lobe and was working on four others.

Go back to RMBuilder's post #8 here. That first 2 hrs. break-in time on a flat tap cam is SO critical! --- Jer

I've heard 2 things on various auto/engine forums.
1) Bad batch of cores from china. Just poor grade material.
2) Comp cams recently cam out with a statement blaming changes in oil formulation. They reccomend Rotella oil for break in.
See: http://www.compcams.com/information/...yID=1985582846

Since I have an engine apart and it needs a new cam, I will bite the bullet and go roller.