I got the cam broke in the BR oil did great nothing in oil filter after 20 min break in and sounds great with this solid cam. Heck of a lot better than the hydraulic cam I had in there. Make sure you check your shafts for wear from the roller rockers if you have the old sets, mine was from 1995. Change bearings the roller is too far apart from each other on the old sets.
The engines "we Buick folk" deal with, flat tappet, roller cam/rockers still have several areas that will benefit from the protection of ZDDP components. It is not just for flat tappet cam/lifters. The protection "lasts" for about 3000 miles, and it certainly will not have any negative effects to run ZDDP oils. Formulations for diesel engines are not optimal for gasoline engines, as they are formulated to deal with soot, and are often not as "clean" (in the formulation) as oils used for gasoline engines. Given the cost to build (or, worse, re-build due to failure) the engines in classic cars, why would anyone try and save a few dollars (often less than a full tank of gas) for several years of "best" product of oil that your engine depends upon? There is billions of dollars and many professional man hours of science in the formulation of good oil. The information is out there to clarify, but you have to get past the "know it all's", the "sales folks", and the hype. It is not hard. Break in oil with ZDDP, (no detergents) then toss it and the filter (inspecting for metal), then use a good ZDDP oil for gasoline engines. Do not add more than recommended (ZDDP additives) and leave the "diesel oils" for your coal burners... Ask the questions, and pay attention to the answers. If someone cannot cite the data to support their "claim", ignore them. You will be able to hear the "truth" from the "noise". Less quality parts, higher costs and all that jazz. Do you want to do it right or do it over? Don't get in a hurry for the sale of hurry. OK, thus endeth the long a** lecture...
