Sir, Infact 5w-40 fully synthetic got popularity like no one had before. And now all companies making 5w-40.
But as the RND departments already keep working actively in big companies to introduce some items that are compatible and easier to get the customers attraction. And hence this new oil 5w-50 comes to the market.
Presently only LM & Mobil has this 5w-50. But very soon other companies will bring this oil too.
Initial response of this 5w-50 oil is good. Its fully synthetic, meets SJ grade and suitable for cars like Rolla.
Am also thinking to give it a try in my car too.