Business rivalry was the reason for his murder, police said.
Police also recovered a country-made pistol, sharp-edged weapons and Rs 3.2 lakh from the accused.
However, the main accused M Srinivasa Reddy alias Bunk Reddy was still at large, police said.
The arrested accused were identified as K Siva Sanothosh Raja (31), S Venkatesh (25), Sankarashan Gouda (23), P Prabhu Das (30) and B Mahesh (30).
DCP Navin Gulati said that both Reddy and Ramu were in the waste oil business.
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In September 2015, Ramu and his henchmen also allegedly diverted an oil tanker which was heading for Reddy's godown, leading to an attack on Ramu.
According to police, Ramu tried to hire Raja to kill Reddy, but could not pay him the full 'supari' amount.
When Raja told Reddy about this, Reddy hired him in turn to kill Ramu.
On September 14, Raja and his men allegedly murdered Ramu.
Two-Town police led by G V Ramana nabbed the gang.