i have 2 diesel Mb coupes ,one a 78 ,the other is an 84 .The compression test on both cars are coming back with bad results.My try with the Marvel product did bring up compression but some holes are still at 140 .I was planning on starting with the 78 and try pouring a cap full down into each injector hole ,spin the motor ,repeat ,then check for compression.Ill be happy if just one of them fires up.Ill post back with results ,what ever they may be.