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Morris XHD 30 'ring free' oil


starman

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A friend of mine was recommended this oil for his Kelvin by a Kelvin specialist. 

Its not one I've heard of - does anyone know of it and its suitability for a Lister JP? It's API CF/CF-4/SF/SG whatever that means. And what does 'ring free' mean?
(Also posted in Boat building  forum)

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Most suppliers are now stocking Golden Film 30 instead I believe.

Despite its high API classification the XHD30 is fine in vintage engines - I've sold it and used it in vintage engines (mainly R-Ns and Listers) for over 20 years.

"Ring Free" was a range of oils produced by Morris with additives designed to loosen and/or prevent stuck piston rings.

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