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Not all GM's.....my uncle has a 1996 cavalier he bought new and it now has 130k on it, and has NEVER had the original DEXCOOL coolant changed out. Runs at normal temp.....no leaks.....in fact the engine doesn't leak or burn anything at all. It can go a year/7k between Mobil 1 5w30 Synthetic changes and the level on the stick remains unchanged. Amazing. Its the 2.2 liter ecotec engine.
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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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