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The CIS-E engines are also SUPER sensitive to vacuum leaks. Every single piece of rubber on the engine must be in good shape. All vacuum line connections, gaskets, seals, etc. Intake gasket/boot under the air cleaner, the smog pump hoses/lines, even the o-ring on the dipstick for engine oil can leak vacuum!
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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