Does it matter how the car is oriented on a slope when sucking the oil out through the extractor pipe next to the fill opening?

Is the ideal orientation to extract max oil with the rear of the car lower than the front ? Ie parked with the nose facing uphill?
And with the Rear offside tire lower than nearside?
Slope is about 1 in 20.

Thanks

and your engine is ???????? BMW i3 Electric Car
2012 Full Fat RR 4.4 TDV8 (now gone)
2006 VW Touareg 3.0 TDi V6

I have exactly the same problem because my drive slopes.
However I have bought a pair of plastic car ramps which I find best placed in front of the rear wheels, so that when I drive up them the car is dead level.

Nice one Baltic.

Looks like you have the same degree of slope.

What results did you get on the slope when using a vacuum pump?

I didn’t want to try sucking the oil out with the car on a slope because it would be impossible to get an accurate reading of the new oil when refilling.
Once I levelled up the car as shown then draining and refilling was very simple.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Just out of interest, what make are those ramps you're using ?

https://www.ebay.co.uk/itm/RHINO-RAMPS-HEA...635-2958-0

eBay link…
Rated at 5 tonne, I like them because they are very wide and easily take our width of wheels.

Mike G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Thanks, I thought they might have been but thought I'd better check.

Cheers