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My 924s really likes valvoline 20-50 dyno juice. In fact many of the little oil leaks I had running synthetic went away. I just am very careful to change it every 2500-3k. I have used 10-40 and 10-30 the pressure was a bit lower than I liked. 37psi where as the 20-50 it is at 50psi. both these #'s are with water at 180-190F with oil temp at 80c
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