dcdoug We used racing Valvo 20-50 for years until about 7 years ago with solid lifter motors. After that I started running either 15-50w or 15-40w oils. Either Quaker state or Rotella has been in the motor on the cobra since day one. There have been some other things added to this. 1 bottle of EOS from GM and 1 Bottle of Lucas
oil suppliment. The lucas needs to have hot
oil to blend with and a slow pour. My accusump works as a pre oiler and have no dry startups. We have beaten this part to death. I pull the pan every year and cut open the
oil filters. Bearings are fine. Going to add a Magnet for the oil filter. Have a couple of guys that do this. You would not beleive the small metal partials that get through the filters. This catches them and holds them. Doug IMO any good additive with
zinc and phosphorus is going to help extend the life of any motor. IMO the big things are dry startups and not letting the motor warn up before going on the drive. Coolant temp may be 180f but the oil is still around 110-115f. The car running thermostats to help heat the oil, that is a plus. Doug the other thing that effect solid lifters is the valve lash. A little too tight and you could burnt valves or have piston to valve hits. Too loose and you have valve train wear problems. I know guys like solids, I did years ago when being under the hood every weekend was a normal thing, but getting too old and hydro roller are now the in thing and working just fine. They also limit the rpms of the motor and extend the life of it, imo. Rick L.