at 30K and third oil change @ 10K, my oil analysis went to the waste oil furnace, it said the oil was perfect. First change @10K was Castrol 0W40, last two were Mobil 1 0W40.
Either Mobil 1 or Castrol GTX - never had oil issues with either one.
Running the OE Castrol 0w-20, pushing the car very hard up a twisty road in NC/SC, I saw a maximum of 235F with an ambient temp of 75F. My averages with normal driving are close to yours. These temps are well within the oil's capability.
i been using it religiously for now 85k miles, i have tried Quartz Ineo 5W30 502 Spec oils made my engine produce more heat and valvetrain noises. The Castrol Edge 0W40 I use now tops out at 212, normally sitting between 205 and 210. With the 5W30 Quartz it was constantly sitting at 227-237 which is pretty significant.
this oil is my most trusted, been using it since new with the best results ( i tried Mobil1 0W40 and a 5W30 Total Quartz once each and oil temps were 15-20 degrees hotter in similar ambient temps and conditions with both of those so i decided not to use them again).
They also have the 5qts of Castrol Edge 5w-40 for under $30. I've been running that in my cars since 2005.
Last change I did was with Castrol Edge 0w-20 no issues.
I've always run conventional Castrol 20/50 in my Gti's (past and current Turbo) without issue.
Castrol Edge 0W40 A3/B4 (European Formula), about 27$ per 5 quart jug at Walmart. Made in either Germany or Belgium. A real synthetic, Type-4 PAO based (no Type 3). Meets the strictest oil requirements from ze Germans.
I personally used to run mobil 1 0w-40. as you said its super thin and seemed to just barely get the job done. Recently switched to castrol SLX 5w-30 and I am decently pleased with the first two changes.
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