Bro, we aint scientific/biological research people to control environmental issues, neither we are here to discuss dengue OR mosquitoes & lungs of the ppl.
The SOLID FACT is that Diesel engine Loves Oily Fuel, while the market diesel is available in Ultra-Low Sulfur, which is not at all a Healthy Food for Diesel engine!
& what is said about 800 rs. diesel + 200 oil ratio, this shud be done at least once a week OR if u wanna do on daily basis, one should do like this= Rs. 1000 Diesel + 20/50 Rs. OIL on every FILL, DAILY. This is the best RATIO to keep ur diesel engines Happy & Healthy!