Sorry, I've got a derv and it sounds like a tractor at the best of times.
Would never hear a piston slap, little or big end rattle or lifters.
Must admit, that's all outside the car, inside cant hear anything, unless my hearings going!!!!
I always put an oil additive in when I do an oil change, STP, don't know if they would help free off sticky lifters, might be worth ?6 or so to bung some in.
we are around.
