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George,
I would like you to ask your rebuilder for some specifics on the "high amount of rebuild using 15-50 mobile." I have not heard of any engine needing a rebuild simply because of the brand of oil used, however, I may be wrong. FYI, Mobile 15W-50 has the same or more of the high pressure lubricant ZDDP than many other oils, synthetic or dino.
If it is a case of not changing the oil often enough, or a catastrophic failure, then I would understand. Also, I realize owners are not always trustworthy when explaining the cause of the symptoms to the mechanics.
Thanks,
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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