First off, Please understand that not ALL UFA Labled oil is Esso oil, if I come accross that way it is not my intention. UFA Polar in the 0-40 and 0-30 syn is exact XD3 0-30 and 0-40. There are other UFA labeled oils that come from other oil companies too, the UFA attendant will show you the source of any UFA labeled oil yu may be interested in y2k345 if you do pursue UFA oil, I dont want to mislead you or anyone.
Basically, UFA Polar syn 0-40 being Esso XD3 syn 0-40, it still comes down to the same basestocks y2k345 in UFA Polar HDEO syn, Xd3 or D-MO 0-40s and which company Esso or Co-op you trust the most in add packs.
I put down the specs on Co-op D-MO above in my post and Duff kindly gave the updated Esso XD3 specs where you can find 0-40 XD3 specs. You will find the specs on paper to be extremely close.
Personally, I dont think you could go wrong with either oil y2k345, they have great same base stock and the CI-4 specs are met in both add packs. The co-op oil will be bit less money bought in 12 flats. Both oils are also SL gas rated, the 0-30 Xd3 and UFA 0-30 Polar are excellent for gas engines, instead semi syn 5-30 offered by Co-op. 0-40 in either Co-op, UFA or XD3 will do good in gas engines too but quite heavy oil, I prefer the 0-30 XD3 because it is nearly a 40 weight by SM gas rated standards in what I am told in here, heavy stuff.
Esso oils are in many different companies lables, I have been told by Esso bulk station attendant that Esso XD3 15-40 is Ford Motocraft HDEO in Canada. It is in UFA specific bottling, Some Canadian John Deere Oil is Esso XD3, SuperStore HDEO 15-40 a few years ago was XD3 Esso 15-40 for under 2.00 litre, steal. I believe it was YUK who discovered this very cleverly with lable inquiries with SuperStore inquiry phone line that Super Store HDEO came right out of Strathcona Esso refinery at that time. Super Store now sells XD3 15-40 in Esso bottle for over 3 bucks liter, too bad the PC superstore HDEO was dropped by SuperStore.
Co-op DM-0 chose not to just take XD3 and put it in their labeling, they put in thier own additives into the basestock and did thier own testing, according to Co-op it passed with flying colours in meeting CI-4 Y2k345, you have to compare specs and decide which company you trust or believe in most, Co-op or Esso is what I believe it comes down too, personally speaking I go for Esso XD3 in the XD3 HDEO syn, but that is only a personal choice, as I said earlier, if XD3 syn 0-40 disappeared of face of earth magically today I would use the DM-O oil with full confidence in replacement.
Hope I helped some here.
Cyprs