All three of my diesels are male.

Some obvious reasons as to why:

1. the block heater cords which are "male" protrude from the bottom of the front apron.

2. they aren't afraid of a little flatulence now and then.

3. they have gruff sounding idles with baritone voices at higher rpms.

My 300SE and E420 were definitely female.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)