So I went out of town for a week, and left my 1988 rx7 with a 91 engine daily driver on the curbside. When I got back I found my battery dead, so I put a new battery in it. Now when Im cranking it over, it sounds like theres no compression. I put a spoonful of marvel mystery oil in it, and still it sounds like no compression. spinning over waaaay too fast. Is my engine done? anyone with a rotary compression tester want to help me out?