hi guys new on here, just purchased my first work van which is a doblo cargo 1.3 multijet 57 plate. unfortunatley i think i have bought a bad one. it has a slight oil leak which is coming from sum bolts which are loose holding the sum into the engine (garage thought it was a rear crankshaft seal). but my main concern is when the engine is hot, the oil light sometimes comes on when i am idoling but as soon as i touch the gas pedal the light goes off. is this common? is the van ok? would like to hear if this is common / normal? . . .