Ford focus 2005. Dealer recommends full synthetic oil or synthetic blend. Will I be alright with regular oil?

Ford focus 2005. Dealer recommends full synthetic oil or synthetic blend. Will I be alright with regular oil?

Page 182 of your owner's manual says "use Motorcraft SAE 5W-20 or an equivalent 5W-20 oil meeting Ford specification WSS-M2C930-A." That includes essentially all API-SM rated oil, whether conventional or synthetic. The cars will be designed for a particular oil. Use the right one. What does your owners manual call for? Modern conventional oils meet all manufacturers requirement. They just make twice and much money per quart on synthetic oil so obviously it would be better for your car.

The cars will be designed for a particular oil. Use the right one.

What does your owners manual call for?

Modern conventional oils meet all manufacturers requirement. They just make twice and much money per quart on synthetic oil so obviously it would be better for your car.