We have been adding fuel dye to our opil for years, red dye to running-in oil (Castro R 40), blue dye to for 'ordinary' (Castrol 747).
We were advised by Castrol race oil techs that it was harmless and we use a hydrocarbon solvent dye.
They originally suggested (Dylon?) Leather dye but decided on the hydrocarbon solvent to be extra sure. They suggested NOT food dye.
At two drops of dye in a litre of oil (1 in 10,000?) and mixed at 4% (200 ml oil in 5 litres of fuel, 1 in 25) you are running at 4 parts dye to 1 million parts fuel.
The cost is far less than tie wraps and a fraction of the cost of an "OOps, no oil" rebuild when you were rushing to the grid and found the can that someone left a tiewrap on when they refilled with petrol.
And yes, dye the oil when you buy a new can, then you don't have to remember to do it for every fuel mix.
When we started, we used a hypodermic (with a blunt needle)but found that it was a lot of work keeping it clean and unclogged, unless you use an ultrasonic cleaner, and people kept leaving the cap off.
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