-4AN Inline Oil Filter

When using the -4AN Filter on an oil supply line that originates at the filter housing on the 4G63 engine, the .8mm restrictor results in the Garrett recommened pressure at the turbocharger oil inlet. For 4G63 engines that feed the turbo oil off the cylinder head, the .8mm restrictor should be drilled out to .125”. The normal 4G63 engine has low enough oil pressure at the head oil supply port that the .8mm orifice is not required. The filter element provides all the restriction needed to get the oil inlet pressure down to the Garrett recommended values.Oil supply off the filter housing - use the .8mm restrictor as supplied.Oil supply off the cylinder head - drill the restrictor out to .125”NOTE: This is only for use with GT series turbo's.