Don't use them on circle track cars other than for pre lube.If your pan runs dry and the accumulator starts pumping oil into the engine your oil pressure warning light wont come on.your oil pump pumps air as good as it pumps oil and what your bearings are seeing is a mixture of air and oil. this will cause bearing failure and you wont see it coming because the warning light never came on. We have seen this happen over 100 times when racers have there oil light flash on in the corners.instead of fixing the supply problem they believe the B.S. that moroso advertises and bolt on an accumulator.result no more oil light in the corner and rod out the side.Bill