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For a 1999 Solara v6, the oil capacity is 5 qts. of 5W30.
When I had this problem with my 1999 Toyota Solara, the issue ended up being a faulty oil pressure sender unit. The 2001 Toyota Camry uses the same engine (and very likely the same sending unit) as the 1999 Toyota Solara.
STP's part number is S3614. This oil filter fits a 2006 Toyota Solara (6 cyl) and other similar years of Toyota.
5 30w of any kind of oil you like. This is from my 2001 Toyota Sienna Le manual book
5,000 miles
The oil pump is in the oil pan (aka the "sump").
5 qt
Gonna need to be a little more specific, but I can tell you it does take 5w30 oil.
5w30 in which ever brand or type you prefer.
3000 miles is safest
if its not labeld on the oil cap, best bet is 10w-30.