Re: ARTICLE: Synthetic oil vs Mineral oil
The manual does not state that the oil is not suitable it merely gives an indication as to which grade to pick up based on the ambient temperatures of the location of the end user. The numerical values in the grades are not temperature readouts.
Is there a change to the metallurgy of the engine between the older F? series and the new K series. There may be changes to the fuel path, injector nozzle, piston ring & tappet design so on and so forth but nothing that will render a particular grade of oil unsuitable for the old engine. It may not be an optimum grade but unsuitable is unjust.
As for the tolerances being tighter it does not mean that they have moved from say 1-2 thou to 4-5 thous now. What it means is that the tolerances are now more uniform across the entire part spectrum. No car manufacturer is going to indulge you with better tolerances as moving up by even 1 thou across all surfaces would involve major changes in metallurgy & tooling/SPMs viz. a major expense that a manufacturer can ill afford.
Further with the usage of aluminum in place of CI plus with new and improved casting and machining techniques it is very rare to find burrs and shavings these days. As for Maruti, well at least in their old plant there is an engine test bed where upon assembly every single engine is run for a specified amount of time. I believe any shavings if are any would show up right there. I do not see any reason for Maruti to have discontinued the practice at the Manesar plant.
Originally Posted by blackfire_9
What you have stated regarding the 5W30 oil & the temperature range in which it would be effective stands true for the new K-series engines. The engine in question here is the old F series as in the 800cc Alto or the old Wagon R, where the manual clearly states that this oil is not the right choice for temperatures above 10 degree centigrade & as you have yourself mentioned, Delhi does get a lot more hotter than that.
Also, a thinner oil is not bad & you are right here. But that depends on which engine we are speaking of. Most modern engines require a 30 grade oil but it's because of the engine design & better tolerances.
Lastly, about metal shavings, just because the oil is not recommended & is too thin for use in the F10D is why I had suggested to keep a watch on the oil though as mentioned earlier, it's highly unlikely.
You will agree that there has been a lot of developments in the formulation of oils since the 70s to current date. Isn't that what the journey from 'Castor Oil' to 'Castrol' is all about
As for the metal to metal contact, it is only a microscopic film of oil that separates any two surfaces in the block. Even today the good old Castor Oil is pretty much capable of providing that layer of safety, though not for an extended period. A grade of oil slightly off than the perceived optimum grade is then not the worst thing that could happen to an engine.
Originally Posted by sgiitk
Let me chip in. The viscosity of hot oil has a lot to do with preventing metal-to-metal contact between the moving parts. Any metal to metal contact of the moving parts will be disastrous.
The lower end defines not as much the pouring, but more important how quickly the oil circulates in a cold start. Also, many modern cars have hydraulic tappets/lifters and they also benefit from fast circulation. In the extreme case a higher minimum rating can even make it difficult to cold start. I have faced this in the early 1970's in the UK.
If it helps you in any which way. My 2008 Swift zxi has been running on Mobil1 0W40 and the odometer reading is approximately 19K kms as of date. The oil was filled at My Car, a MASS in Poona with the odometer at 11000 odd kilometers and there have been no issues since. Would have posted this last night itself but wanted to recheck the grade of the oil. This is definitely an old series engine and my car seems to be happy with this diet.
Originally Posted by k2max6 K2MAX6
The workshop is refusing to change the oil. They say they get it from maruti and as per Maruti's instruction only they have filled it. I have filled the complaint form on the maruti website. Lets wait and watch.
Anyhow if an oil change gives you peace of mind, do go ahead by all means. I too will be following your posts to see what the service centre has to say apart from the usual "it is Maruti approved" line. I hope you have escalated this to the General Manager of the concerned service centre as resolutions are a rarity at the shop floor level.
EDIT : Good to see the quick response, do fill us in post your visit later in the day.
Last edited by khoj : 17th January 2012 at 14:31.