Hi I have a small oil leak , where should I check for this problem ?
oil leak on 1998 Volvo S90
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.
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