Mobil 1 and Motul, primarily termed as fully synthetic for petrols, are good enough for Diesel's
Again, I don't get why people are saying this! These oils meet the standards laid down by their manufacturers, whether that is a diesel or petrol.
Motul (less expensive) is as good as Mobil 1 (which is expensive)
Incorrect. They cost the same. But the specs show that Motul is a better oil.
Diesel engine are better off with specific oils made for Diesel engines (synthetic or otherwise) ?
Don't confuse the matter. Both tsk & I agree that a synthetic is better than a mineral. That part is clear.
1. No API-CH,CI oil(diesel) is rated for petrol
Mobil Delvac 1 is CI, SJ & SL certified
2. Even the most expensive synthetic oils for petrol are API-CF4 for diesel and API-SM for petrol. I don't really know what does API-CI oil have which API-CF oil does not have. RT says don't worry, as long as your car can take API-CF use it
Unless your vehicle specifically recommends API-CI-4 grade oil, I'd rather use a CF/B4 oil which has a better VI rather than a CI oil which has a lower VI.
3. Viscosity wars, RT is right. Lighter motor vehicle oil will give more cold start protection. I say that if you warm up your engine a heavy duty oil will be equally effective.
Majority of engine damage is done on startup and before the engine reached its operating temperature. This is when the oil has to play its most critical role.
Also, being in the North, winters do get pretty cold up there, and that is all the more reason why this should matter to people up North.
Hmm jaggu that means that you cannot use API-CF4 synthetic since the manual says API-CG4 minimum?
So that leaves you with Castrol GTX diesel(API-CI), Shell Helix (Forgot the exact name) API-CG4 or the Bharat petroleum thingy
"Be sure that the engine oil you use comes under the quality classification of ACEA B3. The recommended engine oil is SF 15W 40, API CG4 or above."
This is where it gets weird!
First they say ACEA B3, which is for High performance and/or extended drain passenger diesels
Then they say SF: which is an old API standard for petrol engines of 1988 or older!
Then they go ahead and say CG4 or higher!
So the oil that meets 2 out of the 3 standards mentioned would be Delvac1. It would be interesting to see what oil Maruti themselves use. Jaggu, think you can find that out?
It's already mentioned above in the earlier posts Jaggu. The links in the very first post on this thread give the time line for API standards, and my post #441 gives the explanation of ACEA standards.
Even I found API-SF funny.
If they had said B3 and API-CG4, understood,
Delvac does not meet B3 standards only E standards.
However there are numerous mineral oils which meet API-CG4 and B3 standard, and also the petrol standards till SJ!
Moreover there are so many companies marketing synthetics (Valvoline, Chevron etc., etc.,) but we see only Mobil and Motul here, and some Castrol.
Also can you post some link which gives details of ACEA standards, you can add it to first post.
Hmm this brings an interesting question, Japanese automakers follow JASO.
Do Honda/Toyota/Suzuki manuals contain JASO ratings, like VAG has VW and MB and MB ratings?
Honda/toyota owners please comment?