Went and started my truck this morning and noticed a knock type sound. It did not sound like a tick from lifters but more like rod knock. Hope that isnt the case. Motor is the 5.9 and I did an oil change last week and put 10w30 in it. The weird thing is it didn't do it after the change. It started today. Checked oil levels and they are still the same so far. In case it makes a difference its been on average about 30 ish degrees the past few weeks.