I went as 'rich' as 50/50 mix of diesel and WMO/ATF in my F250. It ran beautifully (no smoking issue and had much more torque) but there were some cold start issues with such thick fuel. The truck would still start even in relatively cold weather, but it did complain a bit. I had duel tanks so I could startup and shut down on straight diesel to eliminate the problem. I think I mentioned this before, but I would be a little concerned about your electric lift pump overheating if the fuel mix was too thick.
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1986 F250 Diesel with 3.08 gears, E4OD, turbo
1996 Saturn SL1 EV, 32KWH lithium (LiFePO4) battery
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