you have to be kidding. the V6 heatsup superfast. and I think they all could use a oil cooler.
mine get warm so that the heater starts to heat by the time I drive out the parking lot. and it is just getting to full temp by the time I hit the freeway a few blocks away. the oil take a lot longer to heat then over heat(the normal state in a alfa) as I get see just watching my oil PSI drop.
if you want slow to heatup try a 68 toyota 4cyl or almost any 4cyl they seem to be still comming up to temp just as I shutthem down after driving to work.
I rember I would start my 68 in the winter and let it run for a 1hrs in the driveway to get it so the windows would defrost. just way too much iron for 2L of displacment.
I love the 75 in the winter as it seems to have instant heat + the heated seats
I think the only car I have seen with better heat was one that used the A/C in revirse so the cold was put outside and the heat inside untill the car warmed.
now that was real instant heat.