Appreciate some help here with a post on another forum. I like to come across as a know it all but unfortunately I know *-all. Here's the post "Hello all. I'm really hoping for some feedback from people familiar with the Nissan Cefiro and engine oils. I bought some eni brank i-Sint tech 0W-30 synthetic engine oil for my 2.0 L Nissan Cefiro. When I got home I found the manufacturer says it is only for certain VW engines and NOT allowed for use in all engines. I don't know if this is just standard CYA or if other engines really can't use it. Does anyone use this oil in the Cefiro or know of people who do? Manufacturer's info: http://www.enischmiertechnik-datenblaet ... 1008_e.pdf "eni i-Sint tech 0W-30 is a modern fully synthetic engine oil with lowered HTHS Viscosity, which had been especially developed for vehicles with gasoline and diesel engine of the VWGroup starting model year 2000 with prolonged change interval including pump-nozzle engines with prolonged change interval. " "eni i-Sint tech 0W-30 had been especially developed for the engine generation of the VWGroup for vehicles starting model year 2000 with prolonged change interval including pumpnozzle engines. Due to the prolongation of the maintenance interval oil changes up to 30.000 km are possible for gasoline engines (VW 503 00) and for diesel engines (VW 506 00/506 01) up to 50.000 km respectively max. 2 years. " "This special engine oil is not allowed for the universal application in all engines." And here’s my initial smart-arse response “I don't buy synthetic oil, but if I did, I wouldn't buy this stuff, because:- (a) I've never heard of it. That might just be my ignorance, but that's the ignorance I have most readily available (I don't have a smartphone). (b) the logo looks (suspiciously?) like Agip's in style (c) I don't do many miles, so alleged reductions in fuel consumption aren't a primary concern to me (d) it says on the bottle that I shouldn't. Its quite difficult to get any specific information on oil, since its all proprietary and secret. (They won't, for example, usually tell you how much ZDDP is in it, which is of concern to me) so when they fairly specifically say "don't use this stuff" that's perhaps worthy of some attention, though I'd guess that instruction is lifted from the VAG spec. and doesn't originate with the manufacturer of this stuff. Id guess the implication is that the lower HTHS viscosity might result in higher wear rates in wider-tolerance engines than the stuff is targetted at, because the crankshaft (for example) will tend to rattle around in the bore some. I'd take it back for a refund/credit note and buy something mainstream with it. If I couldn't get a refund I'd cut it with a high proportion of the highest viscosity oil I could easily find. I'd probably use CPC straight 40, which is widely available and cheap. You'll probably want to use a synthetic but you wont find one in a straight grade. IIRC Costco had 15/50 Mobil 1 at a fairly good price, though I don't know much about synthetics or their local availability. http://www.mobil.com/usa-english/motoroil/files/mobil_1_product_guide.pdf (couple of years old, so may be out of date) Incidentally, if you get any responses to your "has anyone used this in a Cefiro" enquiry they are unlikely to tell you anything useful unless it was either (a) completely disastrous (unlikely) or (b) they have done a before and after series of oil analyses (VERY unlikely).” I’ll forward and attribute any useful responses to BITOG. Thanks in advance.