my renault 19 which has under the cylinder head gasket a nice fat film at 2 cut off, my brother (previous owner says) he would have had that for a long time. but doesn’t need a new seal soon?! then at the lower part of the engine already a rust-colored layer….. when I start the engine, come the first 5 sec strong smoke exhaust exhaust (as if you had a rocket stuck in the exhaust) but the engine actually runs very well !!!