1998 GMC Sonoma Owner's Manual - Page 261

Before closing the hood, be sure all the filler caps are on properly. Then lift the hood to relieve pressure on the hood prop. Kemove the hood prop nom the slot in the hood and return the prop to its retainer. Then pull the hood down firmly to close.It will latch when dropped from I O to 12 inches (25 to 30 cm) without pressing on the hood. The oil dipstick on the 2.2L engine is under the fill cap. Turn off the engine and give the oil a few minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. Engine Oil It's a good idea to check your engine oil every time you get fuel. In order to get an accurate reading,the oil must be warm and the vehicle must be on level ground. The oil dipstickon the "VORTEC" 4300 engine is a yellow ring. 6-11