Mix the Worcestershire sauce, seasoned salt, garlic powder, and garlic salt until well combined, stirring to dissolve the dry ingredients, then add the oil and warm it in a saucepan (it is ok if it gets hot).
Combine the cereal, peanuts and pretzels in a large roasting pan and mix throughly.
Pour evenly over Chex mix and stir/bend thoroughly (usually until the oil doesn't cling to the pan).
Bake at 250 degrees for around 1 ½ hours while mixing thoroughly every 15 minutes.