ever hear of a block testing kit
 

just browsing info on blown head gaskets in toyota supras and i came across a reference to a block tester kit. it is used to analyze coolant for the existence of exhaust gas and allegedly positively id's a blown head gasket. i was wondering if anyone had ever used this on w124's with the prone 104 engine. will it yield the same sort of result?

Head gasket problems on MB's are usually external OIL leaks. This is a chemical check for exhaust in the coolant & yes I have one of these block testers in my toolbox. Even NAPA sells this test kit & replacement fluid.