Both terms are commonly used in English. Here are examples of both:

Oil Radiator: http://www.trade-post.com/oil-radiator/

Oil-Filled Radiator: http://www.dmart2000.com/lak70oilfilr.html

“Oil-Filled Electric Radiator with automatic thermostat to maintain a constant temperature. Automatically cycles on and off. Sealed oil is heated internally--no fumes, flames or refilling! Enclosed heating element is sealed to provide additional safety. 600/900/1500W heat settings. Easy-roll casters. Baked enamel steel. UL listed.”


Even if one is certain that the device in question serves only as a heating unit, I would not call it an oil heater, because the source material uses the term “radiator,” but the term “oil heater is used as well. Here is an example:

http://www.epinions.com/compare.html/submitted_form_~side_by...

“PRODUCT OVERVIEW:
Pelonis Oil Heater HO 157
Adobe Air HeatStream Oscillating Ceramic Heater C2000
Honeywell Oil-Filled Radiator HZ680
Toyotomi Kero-Sun Radiant 40”


The term is slightly confusing, because it used to refer to a different kind of heating unit. Here is a description of the old type:

http://ourworld.compuserve.com/homepages/Brad_Haugaard/heate...

“I remember seeing a soldier open the front of an oil heater at the Unit Police office where I worked for a while and jump back or be blown back by a sheet of orange flame that leaped out at him.

They were about waist-high, barrel-shaped devices with a sheet-metal shield around them. The shield prevented the unwary from searing themselves against the hot burner, but the many holes in the shield let the heat get by. The only real opening in the shield, as I recall, was the little door in the front with a tiny hole in its face so you could see if the fire had gone out, which it often had. They sat in a square metal pan that caught the oil drippings, and consequently, had a certain air about them.”


Oil coolers are different creatures. They are radiators, too, but not for heating. They are for cooling the motor oil in vehicular engines (aircraft, sports cares, etc.). Here are a couple of examples:

http://neptune.spacebears.com/cars/stories/ocool.html

“Oil coolers are frequently installed as original equipment on such high-dollar sports cars as the Winston Cup Monte Carlo, the AAR Eagle, and the Porsche GTR-1. Why? Because on the fast- paced and congested roads travelled by these cars, it is critical for oil to remain at a lower and more stable temperature.”

http://www.type2.com/rvanness/oilcool.htm

“An Auxiliary Oil Cooler Option: The 1600 in my '71 Westfalia sometimes reaches a peak oil temperature range of 230-250° F on a long, sweltering summer highway run (measured with a VDO dipstick sender and gauge). To maintain my sanity on those particular days, after a thorough assessment of my engine's proper state of tune and its cooling hardware, I decided it was time to add an additional oil cooler.”


As you can see, oil coolers are not heating units.

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