I've removed the rocker covers on my 2000 4.0 P38 to cure an oil leak. When I put the new gaskets on do I use any sealant with them or put them straight on? If I should use a sealant any reccomendations?
No sealant necessary. Just re-use the rubber gaskets...or get new ones. If you REALLY wanted to, you could use some RTV... but I wouldn't bother with it. I'd put some lock tite on the rocker cover bolts though... they seem to always work themselves loose, causing more oil seepage.