Draining or pumping?
Discussion
I was very surprised to find that my local BMW main dealer no longer drain the oil from the engine during and oil change, but vacuum it out through the dipstick tube.
I also have this system but only use it rarely on cars with rounded/seized/meullered/missing (Merc) sump drain plugs.
I wonder how much old oil and sludge stays in the sump after it is pumped out? I would always drop the oil when warm through the sump drain plug but it can be both messy, and time consumming removing some of those undertrays.
Next time I do some BMW oil changes, I will vacuum through the dipstick, and when finished, drop the remainder out of the drain plug just to see how much crap they are leaving in the engine.
If anyone else has tried it, or has the same facilities as me, lets post some figures.
It would be nice to find out I dont need to remove that undertray but I suspect that there is a fair amount left in the engine.
I also have this system but only use it rarely on cars with rounded/seized/meullered/missing (Merc) sump drain plugs.
I wonder how much old oil and sludge stays in the sump after it is pumped out? I would always drop the oil when warm through the sump drain plug but it can be both messy, and time consumming removing some of those undertrays.
Next time I do some BMW oil changes, I will vacuum through the dipstick, and when finished, drop the remainder out of the drain plug just to see how much crap they are leaving in the engine.
If anyone else has tried it, or has the same facilities as me, lets post some figures.
It would be nice to find out I dont need to remove that undertray but I suspect that there is a fair amount left in the engine.
Thanks guys,
It would seem that the days of laying on my back in the rain are over then! I can see that engines originally designed to have the oil purged from the dipstick tube would be ok as they could be designed with the tube hovering over the deepest point of the sump, but was concerned over slightly earlier cars.
It seems all is well then and I will continue to drink coffee whilst the oil is removed instead of trying to realign loads of plastic floppy undertrays.
It would seem that the days of laying on my back in the rain are over then! I can see that engines originally designed to have the oil purged from the dipstick tube would be ok as they could be designed with the tube hovering over the deepest point of the sump, but was concerned over slightly earlier cars.
It seems all is well then and I will continue to drink coffee whilst the oil is removed instead of trying to realign loads of plastic floppy undertrays.
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