I have a 2000 F-150 with the 5.4 L V-8. The engine has never given me any problems. However, upon start up in the morning, or after any extended length of time without running, the engine knocks for 3-5 seconds. The engine then proceeds to run quiet. I'm sure the problem is due to lack of lubrication in the cylinders at start up. Just wanted to know if an oil additive such as 'slick fifty' or something else would get rid of this noise, or is this just normal. My friend's Dodge Ram does the same thing, but my wife's car doesn't. Any input is appreciated.

 

Do a search here on piston slap.

In addition, if you use Fram oil filters or any other cheap no-name filters (Like what quickie lube places use) you need to change to a better filter because these engines rely heavily on a filters anti-drain back valve.

Stay away from any addative for the oil!! (My .02)

 

Thanks for the reply. I get the oil changed at the dealer. They use Motorcraft filters. I'm assuming they have the anti-drain valve you're referring to.

 

yes they do. All of the oil filters that will fit these engines have an anti-drainback valve including the cheapies. the problem is that they (the cheapies) have weak anti-drainback valve on a warpable cardboard surface so all the oil drains out over night so when you start your truck it is like it has no oil in the filter yet so it has to prime the filter before any oil gets to the rest of the engine.

 

Good to know. Do you suggest a different filter to use, or is the Motorcraft one that my dealer is using good enough?

 

yes the motorcraft is a very good filter it is made by purolator (sp?)

make sure the stealer is using 5w-20 or 5w-30 and not 10w-30.