Hrm, I've been dying to check the compression on my 300D, since there is a little blow-by in the engine. Is this relatively easy to do, with the harbor freight kit?

Also, my blow-by is only noticable when I remove the oil filler cap. A little bit of steam comes out of there, but isn't enough to jostle the cap much (it doesn't even teakettle. Virbrates a little, maybe.. but mostly due to the engine shake). I'm guessing I have very little blow-by? Is it even worth me getting this tool?