I'm way past oil changes, 2 since I purchased the car less than 3K ago just to see if it's a stuck lifter. No deal. I pulled the valve cover off the R/S cylinder bank and inspeceted the cam lobes no premature wear as well as the rockers and they appear well. (Chain, wheels, rails, and tensioners are new). I just do not know the difference between the a good lifter over a bad one.. Squishy or hard to compress being good or bad. My new lifters didn't get here yet and the newer lifters pulled from the spare heads have both squishy and hard to compress ones...

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MB roster
'85 500SE euro Ratrod
'92 500E's x2 / '94 E500 stored
'91 560SEC w/43K stored
'92 Cabby 16V OE 2.1 AutoX car
JDM RHD cars now.