AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
What you have to do is look in your manual (I don't have one for the Twin-Spark/JTS).
As Eugenia's link shows, the recommended oil is a 10W40 for all motoring except in very cold climates (-20C, when they recommend 5W30) but the key thing is to look at the recommended API rating of 10W40.
It will say, somewhere, something like S/F, S/G or S/I etc. The oil you buy will have this grade printed somewhere on the side of the pack.
For instance, my 155V6 needs 10W40 S/G or above.
ANY oil (just about) is going to meet or exceed this grade (S/G is actually quite basic by modern oil standards).
I think Selenia semi-synthetic is about S/J from memory, so it is several grades better than the minimum spec' that my engine wants. Before that, I used Shell Helix semi-synth and that was the same.
I don't know what Castrol variety you used but I think even the regular GTX now comes in a semi-synthetic variety, so it would probably have been S/J or better too.
Anyway, that S/G applies to the V6. I stress, I don't know if the (J)TS needs a higher grade than that but you can see that most semi-synthetics would seem to comfortably meet or exceed this.
So, any 10W40 with the API rating which meets or exceeds the grade your engine wants will do the job.
As for price, I find the 5ltr can of Selenia is competetively priced with other similar products -it's actually cheaper than the 4ltr can of Shell Helix semi you can buy from Shell garages, for example.
Whatever you do, don't use a thinner or thicker oil than is recommended as these are likely to knack your engine. Just keep the level topped up and change it often. Then, just about any 10W40 will do the job.
No bullets for Chaingun..