How to know which sump plug my Vauxhall/GM engined vehicle takes?

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These fantastic engines, are very widely fitted to many car makers, as GM added to its stable of makes.  So over time, even the sump plug got changed a few times.
Is there an easy way to tell which sump plug is fitted to my car?
Fortunately, there is. Rather than looking at loads of tables with engine numbers etc, and then still getting the wrong one, because the table wasn’t 100% right, just follow the these simple steps:

Have a look underneath the car at the sump, locate the sump plug and see what it looks like.  

Does it have a round conical head (26.5mm dia.) with a 15mm Hex Head on it?
Then it is an SP15:

Does it have a round smooth outside (25mm dia.) with a 45 Torx head inside?
Then it is an SP6:

Does it have a round smooth outside (26mm dia.) with a 13mm Hex Head on it?
Then it is an SP14:


Finally, once you know which Sump Plug is the right one for your vehicle, don't forget to order it from

If you repair a lot of these Vauxhall / Saab / Opel / Fiat / Alfa Romeo / GM Engined vehicles, take a look at our Workshop Starter Pack, WSP2 

If you only repair one type of these engines take a look at our Maxi Packs, 5Sump Plugs & 50 Sump Washers:
MP6   MP14   MP15

Cars change all the time and we are not perfect. If you have a Vauxhall/ Saab/Opel with a different sump plug, please email us a picture and we will try and help you out. In addition, we will also send you a little something to say 
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