In the past when I bought a car or truck with unknown history I bought cheap oil and filter ran it short time as a,flush.
Then put good stuff in. By cheap store brand or what ever was on sale. Then what I planed on using

[img]https://i234.photobucket.com/albums/ee87/fast340six/sig%20pics/2840886-340SIX-1.jpg[/img]
VP of the MPM in New Orleans
73 Dart Sport 340/ 70 challenger vert. That may still get built, If I live long enough