nothing surprising to me, Mobil is shit quality oil. castrol is good. you should try using 5w-30 in hot weather, it will only make your engine sound and operate better while keeping temperature lower. 260f is very high BTW. 250F are track temps, and anything past that is basically overheating. not good for your engine. removing your plastic engine cover is recommended in this case. i dropped my oil temps by 50f by doing this.
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