I have been doing a bit of reading/ research, and I guess I should have searched first under "engine rattle" as opposed to "lifter noise".
I came across a few posts and have now learned that Castrol Syntec is not fully synthetic (Group III vs Group IV) which really suprised me

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...
I checked the back of the container I found this;
"Not for sale outside the Americas"
I think it is still a very good oil, but I now feel like I have been screwed

. I would usually wait until it went on sale and I last paid $CAN22.00 for a 4.4L container at Walmart when it is normally sells for around $CAN 38.00. However, now that I know it is not a full synthetic I will likely go back to Mobil 1 which I used previously since it is around the same price when the Castrol is not on sale. Also, I might change my oil filter also as I'm now wondering if the anti-drain back valve is working properly.