As well as these devices may (or may not) work....I must say that I find it humorous how people always seem to overcomplicate the simplest of tasks. Just stand back, take a deep breath, and evaluate the situation. Short of replacing the air filter, an oil change is probably the simplest maintenence task on a car. And we are talking about pumps, venturis, vacuum devices, compressed air...so on and so forth. Just pull the damn plug and drain the crap! All ya need is a wrench!!!