IMO oil should be changed at least annually / 5000miles and more often depending on the mileage or use undertaken, i would certainly not be leaving for 18months regardless of how few miles unless stored
the Millers CFS and CFS NT are very good quality oils at their price points (and certainly better than some) but if you want the "best" then the Royal Purple & Motul 300V are top of the tree bar none
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