[TimV]

Yes. The first stage is to use a few heaters dirctly of the alternator. Only starts to heat a few seconds after enginge start up. If i see gains and warm up time can be even shorter if i use preheating the engine before start up. Then I will invest in a battery so it wont drain the starteraccu or shorten its life.

I orderd the first 120W oil pan heater. And a relais (30Amps).
This week was nice hot. But just not to hot so i didnt need to remove the upper grill blok.

I tooked some temperature measurements.
Fuel filter: 45°C
Metal fuel line direcly before injector: 60°C
(Had no time to measure the temp of the fuel rail, beacuse then i needed to remove the plastic engine cover)
Engine oil pan: 65°C
Gearbox oil pan: 50°C

Next week, I work at night, so comming home in colder temperatues. I go measure again, and probably would see the biggest different of temperature at the gearbox.

With this data, I can choose where to place oil pan heaters to help heat up the oil.