No way ! Do not mix petrol with diesel it will ruin your diesel engine and be a very costly repair job.
It does not mix under normal conditions. If this is happening with your diesel engine you may have engine trouble.
Yes it will - diesel is a very good solvent for TiCl4
Yes you can mix oil and diesel for burning brush and stuff just don't put it in any engines!
Mix it with the fuel, usually just put it in the fuel tank just before filling up with fuel
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I have mixed used peanut oil with diesel with no adverse problems. Adding it to bio-fuel will probably just raise the cetane level with no problem.
Worn piston rings.
Not really an option, but if you find it burning extra fuel then replace the injectors.
Generator will not run or miss very badly. Drain all the fuel out and drain the lines. Replace the fuel filter and fill it up with Diesel.
personally I would not mix anything with bleach...NOT unless you are a scientist
Most internal combustion engines are designed to burn petrol (gasoline) or diesel fuel, but not both. Unless the engine manufacturer tells you otherwise, you should not mix the two types of fuel.