2006 Buick Lucerne Q&A
2006 Buick Lucerne Question: What cause a knocking noise 5 to 10 minutes after first start in the morning?
car needs to be looked at to determine noise - globalhelper
This is common for most engines when first started after sitting for a period of time. When a engine sits not running the oil drains back down to the bottom. When it is started the engine takes a second to pump the oil from the bottom back through the lifters in the top off the engine block creating a ticking or knocking sound. Adding a quart of Marvel Mystery Oil helps with this issue, find it at auto parts stores anywhere. - blueblood1281