There is a documented study out there about Royal Purple and the bearing relief the oil provides when compared to all other oils. I believe it is Royal Purple but I may be wrong. Amsoil is also a good brand.
I personally run Castrol Syntec full synthetic. If/when I rebuild my engine with forged internals I will run something different. Most of your known name brand oils will do just fine. When it comes to oil viscosity, you want a synthetic for colder climates.
Last time I was home I noticed they have "high mileage" synthetic oil now... I have been running synthetics since (I think) the late nineties. I can remember when they started coming out with "high mileage" oils but now I wonder if I should switch to the high mileage synthetic... I have about 87,000 miles on a 97 GST. No aftermarket internals yet (Cams sitting on a shelf... ).
I also should say that my car sits for months at a time. I use stabil in the fuel, but not sure what I should do for engine oil...
One last thing to through out there: Lucas oil treatment? Thoughts? Maybe I should use the high mileage synthetic AND lucas?
The only oil I will use any more is Brad Penn. After years of running Mobil 1 and having it darken and black after a couple hundred miles, I prefer putting 3k on this oil and still have it come out looking as if it was just put in.
It is Dino oil, but I have switched 4 cars over now from synthetic with no ill effects.
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