Use the viscosity and grade recommended in your owners manual. The recommended viscosity is probably also printed on the oil cap.
For a 1999 Solara v6, the oil capacity is 5 qts. of 5W30.
Gonna need to be a little more specific, but I can tell you it does take 5w30 oil.
5W30
5w30
5w30
5w30
5w30 is recommended.
SAE 5w30 any major brand of High Mileage oil.
5w30 full synthetic
It is important to use the right oil in any car to help it give a smooth ride. For a 1999 Toyota Tacoma, the right engine oil would be SAE 5w30 .
5w30
5W30