I was told by my indy that it is better to drain the oil because some dirty oil could still be left over by vacuuming it out. Does this detour anyone from the vacuum method? How much old oil do you think could be left behind? Are you all getting out the exact amount that you put in? Also, he said he likes to take off the armor so that he can check for leaks and such while the truck is raised up.
I'm still under warranty and I really don't want to give them an excuse to deny me for any reason so I think I'm going to stick with the Castroil which he sold me for $11 a quart.
I'm still under warranty and I really don't want to give them an excuse to deny me for any reason so I think I'm going to stick with the Castroil which he sold me for $11 a quart.
It would be interesting and educational if someone tried that, though. I have heard this argument before and I think it's BS personally, mostly because old habits die hard. Land Rover has both draining and vacuum draining procedures illustrated in its workshop manuals, and they don't specifically favor one over the other, either. The extraction tube runs all the way down to the very bottom of the sump, below the oil pick-up, so I think there would be very little - if any - extra oil left in there if/when you remove the drain plug. Here is a diagram of the lubrication system (6 is the extraction tube, you see how it runs from just under the oil cap to the very bottom of the sump; 8 is the pick-up, 9 is the oil temperature and level sensor that's secured to the bottom of the pan):