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The only place for a coil spring is up Zebedee's arse
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You've still got locks garage nearby then? Though until you fix the mpg issue its probabbly pretty pointless anyway.

I've deleted that station now

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Yep locks garage is still there.

according to the google!!!

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https://www.amazon.co.uk/Comma-MS5L-Motorsport-Fully-Synthetic/dp/B003BPSW6A
OK, that's an ugly link :(
But that's the Comma oil I use in the Duchess.

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Slightly prettier link to the same > https://www.amazon.co.uk/Comma-MS5L-Motorsport-Fully-Synthetic/dp/B003BPSW6A

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Yoink!!! :)

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Hmm

Seems the XS 10w40 has more Zinc calcium and Phosphorus than the motorsport stuff..

However being a full synthetic its VI is better..

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I still use 20/50 mineral oil, although it’s getting harder to find unless I buy online, synthetic wasn’t around when these engines were designed,, so for now I’ll stick with it..

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V8 Developments reckon it's the zinc content that keeps the camshaft in good order so that's what I'm focussing on when choosing oil for our new engine.

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Zinc is very important for old flat tappet engines from everything I've read. If a genuine lubrication engineer wants to step in I'd love to hear more.
Yes, the Comma 5w50 is lower in Zinc than some other grades at 900ppm vs 1200ppm which is the highest I've found so far. But I went with the higher viscosity and compromised a bit on the Zinc, because it's still much higher in Zinc than oils designed to the latest manufacturer specs (which don't seem to have any at all).

Who's right? Who can tell?!! See you in 50,000 miles :D
(I hope!)