I fitted the cold weather dipstick in addition to the insulated CCV/hoses. There's no folded steel baffle in it to gunk up, which causes the blockage, which causes oil/water to get diverted back into the intake. I also change oil every 3500 miles in winter.

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12 E70 3.5i xDrive
03 E46 330i ZHP
01 E53 3.0i
98 E36 323is
12 Audi A4 Quattro
79 Triumph Spitfire
73 MGB