Originally Posted by Gurrala74
Go with mineral oil eyes closed and without any second thought
Yes,mineral oils have always been there and doing the duty rather well.
Maruti for ex. used to put mineral oil in all it's vehicles prior to adopting to Fiat diesel engines.Even then during the initial days of Swift, Maruti used to fill mineral oil only.Later,Fiat issued a circular to Maruti stating the strict use of Synthetic oil (that too Mobil 1 grade 0W40) in all the diesel engines supplied by Fiat.From then onwards, Maruti service centers started putting in Mobil 1 0W40 oil.However,in petrol powered cars, they still fill in mineral.
Now, coming to pros and cons of synthetic oil : cons :-
I stated cons first, as there is only one.They are expensive and about three-four times than the comparable mineral counter part. pros :-
1.) Better lubrication.The question is do we need it? May be not, as the RPM's our engines rotate might not do justice to the additional lubrication provided by synth. oil.Hence, it is like keeping an additional measure of safety.
2.) Engine Life :- One may argue that we have been using mineral from ages and the engines have lasted for more than a lakh km's easily.Fine, but synth. keeps your engine smooth and like new for much longer duration.
3.) Service interval :- Mineral oils need replacement every 5000 kms whereas it is 10-15000 kms (they can be used even longer, say for 20-25000 kms) in case you use synthetics.
There are more points.These are the ones I could think of right now.It basically comes down to the fact that what vehicle you are driving, how much you drive and for how long you want to keep it.
All high-end cars like Mercs/Audis/VW's/BMW's and more comes factory filled with Mobil 1 full synthetic.Even cars much smaller like Swift diesel comes factory filled with Mobil 1.We have a Swift Zdi and hence I am sure of that.
gokul4h@ Friend, you are not getting robbed. Maruti has been instructed to fill synthetic only in diesel engines as they are Fiat engines and they know their product best (Fiat recommends Shell Helix ultra fully synthetic).As you have a diesel one,service center guys filled it with synthetic.