We claim the ornamental design for a infrared oil heater thereof, as shown and described.
FIG. 1 is a front perspective view for a “infrared oil heater” showing my new design,
FIG. 2 is a front elevation view thereof,
FIG. 3 is a rear elevation view thereof,
FIG. 4 is a top plan view thereof,
FIG. 5 is a bottom plan view thereof,
FIG. 6 is a right-side elevation view thereof; and,
FIG. 7 is a left-side elevation view thereof.
The broken line showing of portions of the heater in FIGS. 3 and 4 is for the purpose of illustrating the unclaimed portion and forms no part of the claimed design.