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Old lifters sometimes drain off and collapse if the motor is stopped with that particular valve open. They should pump back up when oil pressure resumes, if they don't it's completely bad. There may even be a particle in the hole. You may want to replace them.
As for oil, you will get a million opinions on brands with basically no knowledge behind it. Use the proper weight, either and x-40 or 50. Oils are far more advanced now than when these cars were built, any brand will work. Ideally you would want a "racing" oil with a higher concentration of zinc/phosphorus that has been removed from conventional oils to be more cat friendly. Racing oils typically have less detergents and acid neutralizers for extended drain intervals so you may want to change it more frequently.
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1979 928 85 Euro 2v motor,S4 Brakes and suspension, 1988 951 street legal track car(sold)
Neon SRT4 track car
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