I was ASSuMEing that I would hear the cam slap louder when I took off the oil cap. Since it wasn't any louder with the oil cap off, I thought it wasnt the lifter.

I did just put synthetic (mobil 1) in to try fix it. I guess it's a wait and see. I've got the spare lifters to put in, but I don't want to pull the camshaft if theres no point to it.

Could it be leaky prechambers? There is some air puffing out of them - if I spray oil on them you can see there is air leak. NOt a big problem I thought, but I don't know.

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles