[dmaheshkumar]

When ur cars are alws used only for a long run means ,use 15w-40 ,20-40w.This will be bit thicker than the synthetic brands.

When the engine is getting heated(Long run) the oils will become like water.The thickness will change.Since here u r already using a synthetic oil means this will not good for engines for a longerlife.

Mechanical engines without CRDi technolgy will be only adviced to use 20w-40 (Non- Turbo) 15w-40 (Turbo engines).Even some CRDi users are also doing the same.
Castrol is also a good one for engines.

[Catalyst_delhi]

I drive a ford ikon 1.6 1.1 lac kms done. I usually drive long distance and around noida / indirapuram. I presently use 20w50 but manual says 5w30. I personally feel that 5w30 is too thin for an old engine.
I am inclined to use helix / magnatec for the next time around. Please advise which oil I should go for. Last change was done by carnation this time , I am doing this my self. thanks