Discussion
KungFuPanda said:
Sucking the oil out of the top doesn't clean out 100% off the crud which gets left at the bottom of the sump pan. Also, if you don't move the sump plug at least annually, there's a risk of it fusing to the threads of the sumo which makes it impossible to remove without stripping the threads thereby requiring a new sump to be fitted.
Also, it's only a quid.
All true, apart from the plug "fusing to the threads of the sump", which I've never heard of. I reckon sump plugs are one of the least likely bolts to get badly corroded. Also, it's only a quid.
But despite all this, I still believe they DO suck the oil out of the top, and it doesn't make sense to go through the hassle of putting the car on a ramp and probably removing the undertray just to replace a plug that's never going to get used.
As for the cost, it's a fixed price service anyway
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