even on new car or truck manufacturer always put stuff on the part to prevent damage ( rust etc ,even on seal on bearing etc .so what you are seeing is as the oil does its job it is picking up those residue?
you didnt believe me right? ok ok ,the real reason now ,check the engine block and the head or other part hooked to it .is the block made of iron and head aluminium? YOU ANSWERED NO! ok .is the engine made of aluminium and intake or exaust made of iron or plastic or you got a turbo with with an intercooler?
there is your culprit .i wont go into the detail but google this: conductivity of material for plastic iron steel and aluminium. ok you didnt connect the dot ? no problem ! i ll explain .you basicly dont have enough ground .
i ll use a cummin isx for example since it is the engine that is close to a car engine
it as a turbo ,aluminium head , air to air cooler,oil cooler , etc
on the old school 350 all made in iron it mathered little where or how many ground there was .that was then with old unprecise engine
now you ll likly always need a direct ground ON THE HEAD AS CLOSE TO THE INTAKE and another as close to the exaust . dont be surprised ,you might need to ground every things that arent directly connected .got a tube snadwitched between two silicon hose made of aluminium? you will need to ground the aluminium part .what happen if you decide to ignore me ? your engine is likely gona powder coat itself without you . how you ask there is no powder ! it will use what is avail .gas carbon particule etc you ll end up with a thick black coating inside the head and wonder why your exaust is so clean and your engine head so impossibily dirty ( egr for the win)so bottom line aluminium is very friendly with static electricity. so friendly in fact that static electricity will ignore the ground .and now you know why one part of why oil change color!
you didnt believe me right? ok ok ,the real reason now ,check the engine block and the head or other part hooked to it .is the block made of iron and head aluminium? YOU ANSWERED NO! ok .is the engine made of aluminium and intake or exaust made of iron or plastic or you got a turbo with with an intercooler?
there is your culprit .i wont go into the detail but google this: conductivity of material for plastic iron steel and aluminium. ok you didnt connect the dot ? no problem ! i ll explain .you basicly dont have enough ground .
i ll use a cummin isx for example since it is the engine that is close to a car engine
it as a turbo ,aluminium head , air to air cooler,oil cooler , etc
on the old school 350 all made in iron it mathered little where or how many ground there was .that was then with old unprecise engine
now you ll likly always need a direct ground ON THE HEAD AS CLOSE TO THE INTAKE and another as close to the exaust . dont be surprised ,you might need to ground every things that arent directly connected .got a tube snadwitched between two silicon hose made of aluminium? you will need to ground the aluminium part .what happen if you decide to ignore me ? your engine is likely gona powder coat itself without you . how you ask there is no powder ! it will use what is avail .gas carbon particule etc you ll end up with a thick black coating inside the head and wonder why your exaust is so clean and your engine head so impossibily dirty ( egr for the win)so bottom line aluminium is very friendly with static electricity. so friendly in fact that static electricity will ignore the ground .and now you know why one part of why oil change color!
