A half wavelength phase shift occurs due to reflection at the air-water interface, and oil thickness is so small that it doesn't add any significant phase shift.
290 nm

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A thin film of oil (no=1.50)(n_o = 1.50)(no​=1.50) with varying thickness floats on water (nw=1.33)(n_w = 1.33)(nw​=1.33). When it is illuminated from above by white light, the reflected colors are as shown in Fig. 24–60. In air, the wavelength of yellow light is 580 nm.

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A thin film of oil $(n_o = 1.50)$ with varying thickness floats on water $(n_w = 1.33)$ . When it is illuminated from above by white light, the reflected colors are as shown in Fig. 24–60. In air, the wavelength of yellow light is 580 nm.