I've had accusumps on my roadrace cars for years. They were all manual ones mounted in the cockpit, and I never had any trouble with them. I remember a fellow racer once installed one in his vw rabbit IT car from my advice. A few weeks after installing it he was at a regional race at memphis. He had replaced the oil pan gasket and forgot to tighten the drain plug. During his qualifying session his drain plug fell out and he didn't even notice because he never lost oil pressure. A worker displayed the "meatball" flag (letting him know that he had a mechanical problem), but not knowing how serious it was he drove the car all the way to the pits before shutting it off. Didn't do any damage to the engine at all, but nearly everyone there wanted to punch him in the nose for putting a stream of oil around the entire course! That weekend the phrase, "kill da wabbit" was muttered a few times.