Replaced my timing chain tensioners a year ago, never had a rattle before that. I've noticed if my truck sits for a week or so it gets the start up rattle, same thing with an oil change. But if its driven every so often or is warm it won't rattle. Bad tensioners?

 

Did you use OEM tensioners or aftermarket?

 

oem

 

Many assert the Motorcraft oil filter with the "S" post script has the best anti drain-back valve. The S is for silicone.
See if that helps.

 

EngineColdStart Procedure

If a V6~4.0L~SOHC Engine hasn't run in 12hours or longer, this EngineColdStart routine is recommended
to generally PreLubricate critical Engine components & specificly to PrePressurize the TimingTensioners.

• Turn Key To RUN Not START, Let InstrumentCluster Lamp+BuzzerTest Complete
• Push+Hold GasPedal To Floor, InstrumentCluster OilPressureNeedle Should Be At Zero
• Turn Key To START, Let Engine CRANK Without Starting Until OilPressureNeedle Moves Or ~10secs
• Let Key SpringReturn To RUN, Engine CRANK Should Stop
• Release GasPedal, Turn Key To START; When Engine STARTS, Let Key SpringReturn To RUN
• OilPressureNeedle Should Quickly Rise+Hold At MidGage Position

Click here for more info on the OilPressure Switch+Needle.
Click here for more info on the OilPressurized TimngTensioners.