Hi ,

I would like you suggestion for the oil grade suitable for my 1995 XJS 6.0l

I live in Canada but I only use the car summer time

Thank you for advices

Sylvain

 

I get my oil at Costco. It seems like they have sales on dyno oil every other month: a box (12qts) for $27 or something. I believe it is Chevron brand around here

 

I've had great results with both Amsoil 20w-50 or any (cough Royal Purple) 15w-40 diesel full synthetic oil, if your lucky you can find both at Crappy Tire but buying with Amsoil membership is cheaper.

I also run Amsoil friction modifiers in my oil for superior heat/friction/wear reduction and extended oil drain intervals.

 

And you choose diesel engine oil to get a higher ZDDP content ?
Does these engines need this ??

 

I've found remarkable improvements with adding performance diesel products in the Jaguar cars, it may not neeeed ultra high-quality oil or $60 bottles of friction and heat reducing additives but the benefits outweigh the cost if you care about your car.

 

There are as many opinions about oil as there are forum posters! My take is fully synthetic, 5W/30, any well known make. My engine has about 130,000 hard miles and the cams have NO detectable wear at all. The first number refers to the ease with which the cold oil runs round the bearings; the lower the number the better for preventing wear on startup - which in my opinion is the most important aspect for preventing engine wear.
There is an erroneous view that thicker oil protects engines better (I suppose on the basis that it might cushion the bearings more). Also another erroneous view that it is oil pressure that "forces" the oil through the bearings. In fact it is the action of the bearings that "winds" the oil though, like clothes through a mangle. The oil pressure is solely to ensure that there is always a shirt for the mangle to wind - ie always oil there for the bearing to pull through. In principle, thinner oil will give lower oil pressure on cold starts than thicker oil will, because the oil is flowing through the bearings more easily, and therefore protecting them better.
This is the reason hot engines have lower oil pressure at low revs than cold ones: because the hot oil is flowing through the bearings more easily than it did cold.

 

personally as I change the oil & filter yearly which is about 1200 miles I get what ever 10/40 or similar is on special at the time

 

I am using Valvoline Maxlife 10W40 and the engine runs smooth as silk. With only 33K miles on my car it should run good but this oil really has helped. I have run 20W50 and now 10W40 but I am considering using 10W30 Maxlife. I have talked to and researched many Jag owners and also motor oil experts and using a 30 weight may be the way to go... Thicker oil is a thing of the past. Using Maxlife may also help prevent oil leaks that I currently do not have...

 

As I am fortunate to live in a mild, usually dry, mild climate, I choose 20-50. Whatever is on sale. Many times, a Carquest badged product of Valvoline.


My critters have done well on that for decades.


Carl