55, these Nissan motors has a steel timing chain, I am sure the 94 probably does too, not sure though. These timing chains are scheduled to be done at 320k kms. Many dont do it and get away with it, my Nissan salesmans is going to use this 0-30 XD3 to quiet down his Nissan Maxima time chain, his engine has over 300,000 kms, he and my Nissan service manager are extremely impressed with this 0-30 100% syn oil in XD3, it surpasses all 5-30 and 10-30 Esso dino and syn oils in SL/gas rated 5/10-30w oils.
Nissan's oil of choice recomendation is 5-30, 0-30 XD3 will give you higher temp visc than 5/10-30 and -9C better flow rate.
I am now using 0-30 XD3 syn in my 19,000 kms 03 Altima, great oil. I have been warned in these forums not to use the 0-40 in a small engine, these Nissans have tight clearances, the 0-40 may be two thick, one poster in here said he used a 40 weight oil in an older Maxima and it made the engine sluggish and was too thick.
The 0-30 XD3 is $3.71 litre, 0-40 XD3 is 4.20 litre. The 0-30 has TBN of 12.2 as does the 0-40, 5-30 and 10-30 Esso Superflo have TBN of only 8.6, should be lots of shear protection in 0-30 or 40. Both 30 & 40 oils has pour point of -48 C or -57F. A premium 0/5-30/40 dino oil will cost you up to $4.99 like Can Tire Q.S. winter oil and it is semi-blend with no where near the TBN, Flow rate. XD3 0-30 will do the job for you 55, I would stay away from 40 unless you think you have lots engine wear and clearance will take a thicker higher visc.
I learned in this forum Nissans are demanding on oil, that is why I chose this CI-4/SL tough oil, it is a gas rated oil too. For $3.71 litre 55 you cant go wrong, get it from Imperial Oil/Primepro/Esso bulk dealears. I have heard this 0-30 is $5-50 plus per litre at Walmart.
Watch the lables on this XD3 at bulk plant, XD3 was semi-syn, no is full syn, there are still semi syn oils (old stock) get the full syn. On the lable of XD3 you will see a upside down red triangle with "synthetic" written, this is what you want.
I did a post on engine oil viscostities concerning XD3 in Gas engine oil forum, lots good posts in there on winter oil from others.
These Nissan 2.4/2.5 engines are the chev small block motors in Japanese engines, this 0-30/40 XD3 is tough oil at high temps and low, it will do you engine great, I will go 5000kms winter, 6000 kms summer, at price of this syn oil you dont have to extend your OCI. To note, many will use this XD3 15K to 20K in a diesel so it is tough but diesel will not be as tough on oil and these hard working hotter Nissan motors in my opinon. I will use this XD3 0-40 7K kms max in my diesel, at this price point it is not expensive to do less kms OCI, the filter only lasts 7000K max anyway and I dont want unfiltered oil lubing my engine with a bypass filter. XD3 is made by Mobil, Mobil took over Esso syn oil production. hope this helps your dicision, I know I will get 400K plus in my Nissan motor, they rule,been driving Nissan 25 years, never had a Nissan motor fail me yet.
Cyprs