I have an ’07 Mustang V6 with about 40,000 miles and I’m using 5-30 synthetic oil. At what mileage do I upgrade to a higher weight?

Published: May 20, 2009

Many Ford vehicles along with others recommend the use of 5w30 motor oil. On some Ford vehicles, using a higher-viscosity oil can set a DTC (Diagnostic Trouble Code) which is related to the use of wrong oil, contaminated oils, or using the wrong oil filter. Keep your vehicle maintained and use the correct weight, there will be no need for using a higher-viscosity oil.

Jerry Ives
Assistant Professor, Parts Technology
Alfred State College, Wellsville Campus

Tom Dayton writes:

Jerry – The 4.0L is actually one of the FEW recent Fords that 5W30 is recommended for. The general rule is 5W20 for everything EXCEPT the 2.0 Zetec SVT, the 3.3 Villager engine, 3.4 SHO, 3.9 Lincoln, and the 4.0’s. These all take the 5W30 you mentioned. (And of course the diesels running 15W40)

Dayco Adds 29 New Part Numbers to Portfolio

The 29 new part numbers will be available by the end of March for distributors interested in adding to their product coverage.

By Josh Cable

Josh Cable is the editor of Counterman and ShopOwner. He joined Babcox Media in January 2017, and has been working in the field of journalism since 1999.

Published: March 28, 2024

Dayco said it is adding coverage to three of its product lines: serpentine-belt kits, belts and hoses.

The 29 new part numbers will be available by the end of March for distributors interested in adding to their product coverage. The following is a breakdown of the part numbers by product category: