Semi-Synthetic 10w30 ?

[BuffaloZone]

I'm wanting to switch to Valvoline 10w30 semi-synthetic or 10w30 full sythetic - will 10w30 hurt my motor...or help it? Car is never parked outside during cold months, and it gets 100+ degrees here during the summer. Oil changes come every 3,000 miles (mostly highway miles) and I only use K&N oil filters or Mobil 1 oil filters.

 

[fr96ss]

Sean hyland recommends nothing thicker than 5w 30 any type of oil in the mustang motors.

 

[YardSpecial]

Just run the 5w-30 FULL Syn.........

Cheap azz insurance.