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After driving with the new Motul Gear 300 for about 200 miles, my impression is that the new fluid is slightly better from 4 to 5, and from standstill to 1st. It is actually a bit worse from 1 to 2, and from 2 to 1. The characteristics remind me of the car when new. So my current theory is that the actual driving will 'shear' the MTF and make it thinner. Therefore the same MTF would change its characteristics during its life. I slightly prefer the feeling before the fluid change, but the difference is minor. If it is indeed due to age and use, it seems that one has to accept this kind of result.
I won't change it again for at least 50k miles. My next experiment might be Pentonsin.
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