RedlandRanger
Moderator
The proper viscosity is extremely important in modern engines, unlike engines from 30 years ago. Engines are engineered to work with a specific viscosity and changing from what is recommended may have adverse effects. 5W-30 is what Ford recommends for the 2.3.Most important thing is following the maintenance schedule.
As long as the oil is rated properly API/SAE or whatever, too lazy to check, your good. 5/30, 10/30 or 5/40, your probably good.
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