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98 explorer knocking bottom end

driftbendito

Member
Joined
May 28, 2007
Messages
30
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0
Year, Model & Trim Level
95 XLT
I have a 98 explorer with the 4.0 ohv and recently did an oil change using 20w-50 oil and some lucas oil stabilizer (been using 20-50 for some time with good results). Now at idle the engine makes a knocking/rattling sound that seems to be located in the bottom end and is only present at idle. The sound disappears under load and the engine pulls very smooth. What can the problem be. Also it was not doing this prior to the oil change
 












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