=0; [(l)+(m)] is 3; R is H, a 1-4C alkyl or phenyl; R' is a 1-18C alkyl, an alkyloxyalkyl or a polyoxyalkylene; R" is a 1-12C alkyl} such as methoxymethylsilane. Furthermore, the refrigerator oil composition is preferably used in a refrigeration system equipped with a compressor 1, heat exchangers 2 and 5 and an expansion mechanism 4.">
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