Note that a 1999 Camry is a "Gen 4" (1997-2001 are Gen 4). Apparently Toyota has a tradition or practice of releasing new models every 5 years.
Camry's of this vintage were made both in Japan and in the USA. There are important differences and you may need to know when ordering parts. Rumor has it that if your VIN begins with "J" it was made in Japan. Mine begins with "JT2BF" For example I ordered a replacement side mirror and it came with some kind of circular snap in fixture on the back. This was for a USA vehicle, not a Japan made vehicle like mine.
This engine has a problem known as "oil gelling" or "engine sludge". They key is to do oil changes on the proper schedule.
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