This is from Crane cams:
There are some oils with additive packages that are better for camshaft “break-in”. These include, but are not limited to: (Brad Penn or Maxima) or a “race only” petroleum- based oil and include Crane Cams Part # 99003-1
Super Lube” additive. Do not use API rated “SL” or “SM” oil.
CAUTION: We do not recommend the use of synthetic oils for “break-in”. Prior to installing the camshaft and lifters, it is recommended that the crankcase be drained and filled with new, clean oil, as listed above. The oil filter should
also be changed at this time. Proper flat tappet camshaft break-in starts with the cam installation and includes the following steps:
1. Before installing the camshaft and lifters, wash them thoroughly in clean mineral spirits to remove the rust preventative that is placed on the cam before shipping. NOTE: As a “rule of thumb”, always thoroughly clean any part before installing it in an engine. Never “assume” that the parts are cleaned before packaging. During shipping, packaging material can rub into the component surface and must be removed!
2. DO NOT “pump-up” hydraulic lifters before use. This can cause the lifters to hold a valve open during engine cranking, which will cause low compression. The low compression will delay engine start-up and is very
detrimental to proper camshaft “break-in”.
3. With the supplied moly paste lube, coat the bottom of the lifters, cam lobes and distributor gear. Use Crane Cams assembly lube Part # 99008-1 on all other surfaces and components.
4. Set your valve lash or lifter preload. Try to minimize the number of times that you rotate the engine, as this can displace the moly paste from the lobes and lifters.
5. If possible prime the oiling system. When priming, rotate the engine at least one complete revolution to assure
oil gets to all valve train components. Valve covers should be off to assure that all rockers are oiling.