Hi I have a small oil leak , where should I check for this problem ?
oil leak on 1998 Volvo S90
Usually its the valve cover or the oil drain plug and start by putting a piece of card board under the engine area and that will help zero in on the location
Like Valleytech said, try to see where it's coming from. These engines generally leak from a few places, oil cooler, rear main seal an the crankcase breather housing to name a few.