This paper aimed to attempt the fabrication of high-temperature oil-containing porous polyimides (OCPPIs) using as-polymerized powder with a no processing melting point, as well as investigate its tribological behavior. The OCPPIs were fabricated using a cold-press sintering technique containing multiple gradient processing steps. Coalescence tightly among polymer powders was successfully achieved under a high-elastic state by extending holding time vastly based on the time-temperature equivalence principle. The results indicate that OCPPIs possessed a high performance of oil retention after centrifuging in rotation 6000 r/min within 120 min whether low or high porosity. The tribological behaviors were evaluated by reciprocating friction tests under point-contact conditions. Surprisingly, the tribological properties showed counterintuitive performance, wherein the best performance on the anti-friction and wear resistance is encountered for the PPIs with the lowest porosity due to the excellent mechanical performance. The corresponding tribological mechanism with respect to multi-phase wear and liquid-solid lubrication was also discussed comprehensively. This work fills the gap with respect to the fabrication of high-temperature oil reservoirs and contributes to further understanding the forming mechanisms of porous materials under a high-elastic state.