Three diffusion platinum-aluminide (Pt-Al) coatings (noted as A, B, and C) on a second-generation nickel-based single crystal superalloy with a nominal composition (in wt. %) of 5% Cr, 10% Co, 2% Mo, 3% Re, 6% W, 5.6% Al. 8.7% Ta, 0.1% Hf, and balance Ni were tested under cyclic oxidation conditions in the IAR burner rig to investigate their durability in terms of microstructural degradation. The alloy was solution heat treated, machined, and then coated with the Pt-Al coatings. The coatings were produced by initially electroplating a platinum layer on the substrate alloy, followed by chemical vapor deposition of the coating. The coatings were diffused at 1079oC for 4 hours, cooled to below 871oC at -12oC/min., and then cooled to room temperature. Samples in the form of solid cylinders were mounted in a 12-pin carousel, rotating at 600 rpm, and subjected to thermal cycling in the burner rig. Test temperature in the mid-length of the samples was in the range of 1150oC. A total of 1600 test cycles were completed. The tests results showed that coatings B and C had similar performance, with coating B performing slightly better than coating C. Both coatings, however, performed at least two times better than coating A, which failed early in the test. The microstructure of the coatings before and after selected number of test cycles were examined in the scanning electron microscopy (SEM) in backscatter electron (BSE) mode. In addition, standardless energy dispersive x-ray (EDX) microanalysis and x-ray diffraction (XRD) measurements were also carried out on selected specimens with different number of exposure cycles. The stability of the coatings under cyclic oxidation will be discussed in terms of microstructural and compositional changes.