2000 S10 lifters collapsed and resolved

SES light came on while pulling my trailer uphill. Auto zone read a cylinder 4 misfire. Was advised to add Seafoam to the intake. It soon began taking water into the crankcase. Advance Auto suggested Blue Devil coolant additive to no avail. BD is is head gasket "fix." Replaced the intake manifold gaskets; but didn't think to check the lifters wihile I was in there. Changed oil four times then flushed engine with BG engine flush. Still have a nasty rattle... Update! this turned out to be stuck lifters due to the Blue Devil treatment. Replaced a lifter for cylinder 4 and rebuilt the remaining 11 lifters. Runs great now...

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