Question: what is the best product to quiet noisy lifters?
Answer: Liqui Moly 20004 Hydraulic Lifter Additive. When it comes to additives, I trust Liqui Moly the most over all the others. ... 
Marvel MM13R Mystery Oil. ... 
BestLine 853796001049 Premium Synthetic Engine Treatment. ... 
TriboTEX Oil Additive Car Engine Treatment. ... 
Bar's Products Rislone Engine Treatment Concentrate.