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So EFR turbos are sensitive to pressure in the drain system. Eg if you have positive crank case pressure they will push oil past the seals. 14-60psi operating pressure 20degrees rotation from vertical You really need 12mm or larger drain and a larger diameter hose/pipe to the sump. Do NOT use banjo or threaded fittings for oil drain. -10an or smaller is suited to scavenger pump oil return like Porsche. 3/4 hose/pipe recommended a small oil tank under the turbo can help with frothing oil and cleaner return. Thinking of billet fuel filter with filter cove removed so has 50mm diameter chamber to allow foam to settle. More info https://www.miataturbo.net/diy-turbo-discussion-14/psa-efr-turbo-oil-drain-information-read-before-designing-your-oil-drain-93944/ https://turbosource.com/blogs/news/borgwarner-efr-technical-installation-guide This may apply to newer garrret turbos as well. fittings https://www.aliexpress.com/item/32404284074.html https://www.aliexpress.com/item/33052615896.html Thanks to @Andy_Mac for putting me onto all this.