I would say that if there is no way to get at the engine's drain plug then it's better than nothing. I used it on my Acura then afterwards broke open the drain plug and drained out the rest from the oil pan. I would have to say there was almost half of the old oil left in the engine. It's not a quick fix or an easy way to do the job right. Any way you look at it if you want to git 'er done right you still have to crawl around on your back!