Dave S3948
Cadet
- Joined
- Sep 3, 2004
- Messages
- 20
I have an Oil Boy pump that I used with marginal results. <br /><br />First of all my engine is a 5.0 Mercruiser. I have the boat in the water so I thoroughly warmed up the engine so the oil would be hot. After that, I punctured the top of the oil filter to allow it to drain into the pan as much as possible. This also makes less of a mess when you remove the filter (which is what I did next).<br /><br />The Oil Boy pump has the "Garden Hose" adapter which screws on the top of the Mercruiser dipstick so I used that. After several pumps to start the flow everything went fine. I waited until the pump started sucking air before I stopped. <br /><br />Here is the problem........I was only able to extract a little less 3 and 1/2 quarts. I remember a lengthy post on another forum debating the capacity of the 5.0 and when Mercruiser was finally brought into the act they admitted that this engine only held 4 and 1/2 quarts with the filter rather than the 5 stated in the owners manual. But that still leaves me short a bit over one quart.<br /><br />So this brings to mind several questions. If you change your oil using a pump, how many quarts do you typically extract? Does anyone know how far into the pan the dipstick tube extends? If it doesn't go all the way to the bottom of the pan then I would guess that is part of the problem.<br /><br />I am just looking for a satisfactory solution and would welcome any suggestions you folks may have.