By Scott DiSavino NEW YORK (Reuters) -Oil prices plunged about 5% to an eight-month low on Friday as the U.S. dollar hit its strongest level in more than two decades and on fears rising interest rates will tip major economies into recession. Brent futures were down $4.35, or 4.8%, to $86.11 a barrel by 10:09 a.m. EDT (1409 GMT), while U.S. West Texas Intermediate (WTI) crude fell $4.58, or 5.5%, to $78.91. That puts both benchmarks into technically oversold territory and WTI on track for its lowest close since Jan. 10 and Brent on track for its lowest close since Jan. 13. For the week, WTI was…