Originally Posted By: AuthorEditor
I talked to a guy at a boat show once who was selling a gizmo that tapped into the engine someplace so you could run the engine and pump out all the old oil for an oil change. I can't remember the details, but I vividly remember him saying that at idle you could run the engine for quite a awhile (maybe minutes) until there was no oil whatsoever and there was very little danger of hurting anything. Seemed like a wacky way to me to get the oil out, but a lot of boat engines are very difficult to drain. Every boat show has someone selling some new device to accomplish the task. My current boat engine came with a handy pump that removes the oil from the sump, so I don't have the problem anymore.
The 'gizmo' you refer to sounds similar to a PreLuber that I have on a 1997 F-150. It is a pump installed between the sump and the oil filter and is activated by the ignition switch in the accessory position. It simply pulls dirty oil from the engine sump, routes it through the oil filter, and returns clean oil to the engine bearings/galleries for about 40 seconds prior to starting. In contrast to your description, it doesn't require running the engine to pump the oil.
The PreLuber is extremely handy for changing oil. Using a quick-disconnect in the hose behind the bumper, I just insert the hose in a jug and hit the ignition switch to empty the sump. With a change of filter and a refill of oil, I was finished in 7-8 minutes with no need to ever get under the truck.
I talked to a guy at a boat show once who was selling a gizmo that tapped into the engine someplace so you could run the engine and pump out all the old oil for an oil change. I can't remember the details, but I vividly remember him saying that at idle you could run the engine for quite a awhile (maybe minutes) until there was no oil whatsoever and there was very little danger of hurting anything. Seemed like a wacky way to me to get the oil out, but a lot of boat engines are very difficult to drain. Every boat show has someone selling some new device to accomplish the task. My current boat engine came with a handy pump that removes the oil from the sump, so I don't have the problem anymore.
The 'gizmo' you refer to sounds similar to a PreLuber that I have on a 1997 F-150. It is a pump installed between the sump and the oil filter and is activated by the ignition switch in the accessory position. It simply pulls dirty oil from the engine sump, routes it through the oil filter, and returns clean oil to the engine bearings/galleries for about 40 seconds prior to starting. In contrast to your description, it doesn't require running the engine to pump the oil.
The PreLuber is extremely handy for changing oil. Using a quick-disconnect in the hose behind the bumper, I just insert the hose in a jug and hit the ignition switch to empty the sump. With a change of filter and a refill of oil, I was finished in 7-8 minutes with no need to ever get under the truck.