The Maruti Suzuki has a Good Reputation with the DIESEL ENGINES why they have shutted 1.5 l diesel god knows , as it was their own they should have done bs6 changes to it as we know they want to go with more focus on petrol, But if you see the list 10 years number of sales will find more Diesel engines which are best.
I have a swift working perfectly fine , waited for S cross 1.5 Diesel but discontinued so gone for 1.6 130 hp diesel rocket.
Final Verdict:- They shall start 1.5 liter diesel engine with bs6 norms and also focus more towards CNG as they are doing with,
But shall start Diesel engines.