You better do a pressure check first. I had a 300ce that had a slow leak. It turned out to be a small hose under the intake that went bad.

Cheers,
Steve

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97 S500 Coupe 139Kmi.
92 300CE 150Kmi. Sold
89 F250 Diesel 220Kmi. Dead
98 GMC 1500 160K.