Need quality and durability

Dear all, now my car cover 79,800 k. M it's a 2012 model but I purchased 2013. Still I am servicing my car In pvt service center ly, pls don't trust authorised service even they don't know how to wash a car pls trust my words find one good mechanic, all the spares r available in the market and mgp sales counter, but pls use 5w 40 oil for diesel and 10 w 40 for petrol, use 80 /90 gear oil for both models u can really feel the difference thank you.