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E85 is around 1,245€ per liter and 95E10 is usually 1,65€ per liter.
So yea, it's right now a bit cheaper. It's fairly well available in my country nowadays, but prices have gone up making E85 in some cases actually more expensive fuel, expect if the fuel consumption is less than 15% higher compared to gasoline.
This is M52B25TU engine, so it can be running even at 102C coolant temperature, but the fan will be then used fairly often.
Normally running 95-97C while cruising 100km/h.
The temp drops quite quickly to around 85-87C when going high load (electronic thermostat).
Oil temperature is about 100C after a while driving.. not sure if I could try 0W20 oil, or just 0W30.. currently 5W30 and there's no really ethanol mixed in it because I drive quite a lot.
If I knew what kind of bearing oil clearances there are, and what the oil pressure is, I would know if it would work without issues on 0W20.
I had another six cylinder engine with 14:1 compression ratio (+20bar cranking pressure) running on E85.. with almost as small cams the BMW has, but without variable valve timing (BMW has vanos for both cams).
But it wasn't for fuel economy, even tho I noticed it was quite fuel efficient compared to it's factory condition.
I couldn't cause any engine knocking, even when I had too much ignition advance (my own mistake) and on the lean side mixture for full throttle / high load.
I do agree with that, I have a lot more where I can improve fuel economy.
Longer gear ratio is on the list (6spd swap + 2.93 vs. 3.23 rear differential ratio) and full undertray (missing two pieces below engine and transmission).
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