I got a polo petrol & during a checkup at 3500 km was advised by the SAC to top up with 1 liter engile oil. VW uses castrol magnatec 5w40 and I have a Shell Helix 5w40. Can i top up with Shell which has same rating.
I gave my car today for servicing at the TATA S.C. for its second free service at 10000kms. Since I purchased an AMC with the car, the engine oil & a few other consumables were provided free. The estimate bill amount was made & I was shocked to see 600 bucks for a bardahl engine oil additive. When enquired he said "Sir, We are using this additive in all the cars now. It gives a better protection to the engine & blah blah blah". So went ahead with it & didnt give any objection to it.
But my query is do these engine oil additives really work?? If yes then is it worth going in for a small car like nano where I can easily get another can of oil for next service by saving the money for the additive??