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ZDDP in motor oils


Vehicle Information: Year: 1979; Engine (Size, Modifications): 3.3liter turbo, B&B intercooler; Total Mileage: 92,000;

I see alot of postings on motor oils and the reduction of ZDDP. I would like to stick to Castrol 20W50 DINO oil. Have read alot of Brad Penn recommendations on the forums. Is it still safe to use Castrol GTX 20W50 or this getting bad for my rocker arms and cams since the trend in reduction of ZDDP in motor oils? What specific (Brand name) oil additives are cost effective to add to Castrol if the oil is marginal as formulated?

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