AlexSyb, The OID for the Drac7 should be 1.3.6.1.4.1.674.10892.5.4.700.20.1.6. You can find this and other temperarture OIDs, for both OMSA and the Drac, on page 38 in Table 19 - [URL] me know if this helps answer your question. 
Hi  Wanted to find the oid for getting the inlet temp on a R620 iDrac7 server.  Can't seem to find it  thanks
snmp OID for inlet temp on R620 iDRAC7