My Esso Agent tells me this XD3 syn oil reduces oil consumption in comparison to 15-40 use by his customers. I personally have found less oil consumption in my 92 Dodge Cummins.
My Nissan service manager is a very seasoned mechanic, when I told him I was using XD3 in my new Nissan QR25DE he told me he highly recommends XD3 and would not suggest anything else according to his experience in oil use. In years past to current when people have sludge buildup causing things to stick he recommends two OCIs with Esso XD3, if things do not improve after that then time to open up engine. He told me XD3 generally does the trick. XD3 has been around a long time, these 100 full syn oils are relatively new, they were semi syn a year or so ago.
I am breaking in another QR25DE now, I am using XD3 5-30 dino to seat in prior to the 0-30 XD3 syn use, excellent oil, I am using the high detergent to flush this engine 2 times within first 5K, two flushes after 700kms on factory oil. This oil is great protection, has same basic specs as XD3 syn, when I do switch over to XD3 syn, there will be little shock to engine in additives and my engine will be clean from start and stay clean with XD3 syn in life time use of car in my opinion.
To note, this XD3 5-30 syn oil at 2.60 litre basically outspecs the $6.00 per litre Esso Superflo on spec sheet, only -3C difference on flow rate from Superflo, the TBN is 25% greater with XD3 dino than Superflo, the 100C visc is 1 point higher at 11 on this XD3 5-30 dino than 10-30 Superflo syn. This XD3 in dino or syn is great value and is SL rated for gasoline engines, it will keep them clean. A clean engine is a healthy one, much like our bodies, clean blood and system = longevity.
I use the XD3 0-30 in the 4 cylinder QR25DE and 0-40 XD3 syn in the diesel. This is heavy duty oil, the 0-30 is heavy, its TBN is 12.2, the 100C visc is 12.1, flow rate of -48C. To give example how good an oil this is, Esso Superflow 10-30 syn oil is 10.1 visc at 100C, TBN of 8.6, flow rate -39C. Depending what your driving, the 0-40 may be too heavy, a V-8 or large 6 maybe okay with 0-40 in gassers, in small 4 bangers you may want the 0-30. Quicklude also pointed out that the 0-30 sheared less than the 0-40 in his PSD, keep in mind the 0-40 has same TBN but but 15.7 Visc at 100C.
What engine are you using?
Cyprs