We have a reciprocating compressor (motor driven) at UOP CCR-Platforming unit. Service of this compressor is Hydrogen. Recently we have noticed that its lube oil temperatures are rising. We have checked the cooling water flow of the lube oil cooler and found it adequate. Please provide expert opinion regarding causes and remedies of rise in lube oil temperatures.We are using Shell Rimula R2 Multi 10W-30 (CF4) for lubrication.