Need diagram where oil plugs are to change oil on a 1998 harley electrc glide classic

Hi, Anonymous and the usual suspects are:
1. Insufficient oil level or no oil in engine or tank.
2. Air in oil system that needs to be bled.
3. Blockage in the oil tank or line.
4. Oil pump failure.
5. Faulty oil pressure sending unit.
6. Grounded oil pressure light circuit.
7. Oil maintenance light needs to be reset.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
Oil Light ON
https://www.carlsalter.com/pdfs/Harley%20Davidson-HD%201984-1998%20FLH-FLHT-FXR-FXSB-FXEF%20Service%20Manual.pdf
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
Safety Recall Information Harley Davidson USA
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Hi Anonymous, for more information about your question please visit the websites below. Good luck and have nice day.
picture of 2004 flht drain plugs Google Search

Hi Anonymous, for more information about your question please visit the websites below. Good luck and have nice day.
How to Change the Fork Oil on 2012 Harley Davidson Street Glide Cycles Capacities and Fluid Requirements Fork Filling Quantities

It's on the bottom of the transmission. The oil tank for the engine is there.

The oil pan is on the bottom of the transmission. Look under the transmission and you'll see two drain plugs. The one closest to the front left corner is the engine oil drain. The one closest to the center is the transmission drain.

Good Luck
Steve

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if your looking under the bike your oil drain plug will be the one facing forward on the oil pan and it will take a 5/8" wrench to remove it, there is also an identical drain plug facing down that is for draining the transmission oil.

Everyone has their favorite spark plugs and oil. As for spark plugs, I like NGK plugs because I've had less problems with them than any other plug I've ever run.

As for oil, it depends on whether you're talking petroleum based or synthetic. Aftermarket petroleum based, I like RevTech. Aftermarket synthetic Mobil V-Twin.

the crankcase drain plug is under the engine, but the skid plate is covering it, thats why you dont see it. oil changing is done by removing the drain plug of the oil tank

No oil pan plug, it is a sump system. Just find the oil tank, drain it, change the filter.