The quick and easy answer is "on the bottom". Which oil? Engine, transmission, front or rear differential, or other? The same answer will likely apply, but is there something specific that has you confused? Perhaps the splash pan under the engine? If so, there is a hole that you can reach up through to the drain plug. Unfortunately this does not allow access to the engine oil filter. For that you will have to lower or remove the splash shield. I usually just lower it by removing two 12 mm head capscrews right behind the bumper and lowering the shield. Does make a mess out of the shield when you get oil draining down onto it. Removal isn't much more difficult, a couple more screws, and you can keep it cleaner.
A wrench
The 1998 Subaru Forrester does not have a drain plug on the bottom of the fuel tank. You can drain the fuel from the fuel tank by removing the fuel line.
15mm for top and bottom. Bottom one has a magnetic plug - check it for metal shavings.
Dexron III. It will take around 4 quarts if you drain using the drain plug on the transmission driver's (left) side.
.0440
It's a 17mm, but you could have discovered that by trying wrenches or sockets until one fit. --Ken
Automatic trans drain plug is on left side of pan(for atf). differential oil drain plug is directly below differential. Manual transmission has only one plug(below differential in center of trans)
Assuming that yours is the same as my 2000, and assuming that you are asking because you want to remove the drain plug, recycle whatever comes out, and refill with fresh fluid, the refill is about a gallon. This operation is recommended yearly to extend transmission life.
New spark plugs and possibly plug wires.
SPARK PLUG GAP1999 Subaru Truck Forester AWD 2.5L MFI 4cylThe Spark Plug Gap.044 (In thousandths of an inch)
A 2000 Jeep does not have a torque converter drain plug.
Yes, you should replace the spark plugs in your Forester at the intervals recommended in your owner's manual.