2005 winter engine knock

[martyf250]

every year when the temps get colder 50 degrees or below my engine gets a loud knock until it warms up to operating temp after driving it for 10 minutes or so. It has done this for a few years now. is this something normal or a bad knock sensor?

[dawgn86]

what weight oil are you using?

[martyf250]

5W30 Valvoline full synthetic

[volvite]

Next oil change, put in a bottle of Lucas Oil stablizer. It will quiet down the loud noises at cold start up.

[disallow]

I always think its funny when people think 50F is cold.... lol

Its perfectly normal, as long as the noise goes away upon warmup. As volvite mentioned, additives can help, but they can also mask issues too.