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I'm pretty sure that, for DD service it will be fine. GF - 6 as I understand it, adds LSPI to the standard. Nothing wrong with that, but our cars have been running fine on GF - 5 for a long time and they'll probably keep on doing so.
Personally, i get Pennzoil Plat at walmart for $22/5L. That's about 2X the KIrkland, Amazon, Supertech price, but I sleep just a wee bit better and only spend the money a couple of times a year.
And, I chafe at the idea of putting more $$$ in Amazon/Bezos' pockets
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Slow is smooth, and smooth is fast
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