I doubt you'll need to use any special oil on this type of engine. Despite what they were advertised as back in the day they are low-performance engines with low valve spring pressures and only a 4,500 RPM red line. My old '84 Trans Am daily driver that I finally retired last summer due to rust had 204,000 miles and I always used regular off the shelf motor oil. Engine still runs fine and idles smooth.
One thing about the CrossFire engines is to keep the oil frequently changed! The fuel injection system is calibrated on the rich side because of the rather poor intake design. The oil gets dirty a lot faster than a carbureted electronic Quadrajet engines.
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1971 Trans Am 455 H.O. - Cameo white
1982 Recaro T/A 305 - Black
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