old mutly leaking oil out the oil pressure sensor ..can i get just the yellow plastic washer type thingy or do i have to order the whole thing ??
Not sure if the same on a Multi (but I bet it is) but a new sensor can be had for a couple of quid, so not worth just changing the washer. e.g. Vauxhall Agila Astra Corsa Meriva Signum Oil Pressure Switch Brand New | eBay
put a new pressure switch on my ss last year as leaking through the middle 4 months on its weeping through the middle think it designed like it to keep the connector nice and oily and stop it from rusting think it was £28 for mine
"Opel Agila 1000cc. The General Motors code is 90.534.902".. if it's the same most later dukes, same part! Changed mine after it started to leak through the middle A few quid from a parts shop!