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I have had zero success with using the old fashioned Marvel mystery oil/ Kerosene/ tricks that work with other engines when applied to the M96.
The lifters have very small internal passages and when they become clogged the solvent/etc will not attack the gunk well enough to remove it.. If it does it'll more than likely just go to another place within the same lifter, or the next one down stream..
I have had success pulling lifters, taking them apart and cleaning them, BUT that takes a lot of time.. You end up paying as much in labor as the cost of new lifters.
if anyone reads this that plans on doing the lifter swaps themselves, you might want to think twice about buying the Porsche lifters... The Febi replacement units are much nicer.
We ended up buying new lifters and having new internals made for them, these don't clog nearly as bad(if ever) due to their design and clearances.. And we can apply this technology to used lifters and resurface them if money is a concern. (as long as the lifter isn't damaged.)
The same goes for timing chains... Porsche designed them "linkless" so they can't be changed without full tear down.. We put a stop to that!
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