Is this filter used in all Mini's and if not which models use it?

that one has the oil filter bypass switch on it, so Morris 1100/S and Mini Deluxe/K... maybe

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did I tell you that I won a trophy?

On the Australian produced cars from about 65 to 69.

but not Cooper S

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did I tell you that I won a trophy?

Any reason why not used on Cooper S?

Cooper S engines came from the UK

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That is why there are different sized cartidges for S versus Deluxe & K

The one removed from my 1970 K does not have the bypass switch, though it does have the mounting face with the hole unthreaded and I assume that there would be a least one more hole to activate the switch.

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1970 Morris Mini K

The oil pressure differential switch on the filter head was deleted in 1968. It compared the pre and post filter pressure as a way to highlight a possible dirty cartridge.

There is an oil filter warning light (separate from the oil pressure warning light) on the instrument panel.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

As far as I can tell the part attached to the oil filter head, part number 13H1492, is used for the oil pressure light on the dash and will not affect the operation of a Cooper S if it is not connected. Please correct me if I am wrong.

You are correct, it will not affect operation if not connected.

Just to clarify the terms again in case there's confusion:

* 13H1492 switch on the side of the filter head is the differential switch to highlight a dirty filter, with light on the dash.

* The switch to highlight low or no oil pressure is on the side of the block for non-Cooper S models. On a Cooper S it's replaced by a line to the oil pressure gauge on the dash.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Thanks Doug for the clear explanation.

Thanks winabbey and cooperess. I have a 66 Cooper S and the oil pressure light on the dash is remaining on, even after changing filter and oil. It may have been doing it for years - I only discovered it when replacing a blown bulb in the dash. I have good oil pressure (now that I've replaced the oil pressure bypass spring with the correct one). Could the oil pressure differential switch in the oil filter head be the problem? It doesn't look like it's easily replaceable. I recognise that I could just disconnect the wire, but I'd prefer to have things working the way they were intended. Advice welcome!

First thing would be to disconnect the wire. If the light is still on then the wiring might be shorted to earth or its wired up incorrectly. If the light goes out then the switch in the filter head is closed.

On a 66 S, are the filter bypass and oil pressure lights still separate? Have you checked which one is actually lit and if the holders are in the correct positions.

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1986 Mayfair (998 auto), 1974 S, 1974 Van, 1972 PMG Van

Too many minis