I got an 87 Cadillac Deville about two years ago that has 170000 miles on it with the awful 4.1 motor. I bought it to be a figure 8 demo derby car. I did change the oil and added Kreen to the sump mainly for giggles to see if it would clean it up November of last year. It got maybe a 100 miles of stupid fun driving around the farm before it got put away last year and hasn't been touched since. I just realized today I never drained that oil, so the HDEO and Kreen are still in the sump. The 4.1L has a history of gasket leaks. Went over and started it up today and took a look. No leaks, anywhere. I guess this stuff is safe for gaskets for long periods of time, and by my own hillbilly forgetfulness I tested that out. Now I just need to fix the flat tire on it to get it ready for winter fun.
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