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I was told by a retried Jeep mechanic to use Rotella 10w40 T5 or T4 if T5 is not available. He then said do not use T6. He did not say...
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A lot of questions. I have run Rotella 10w-30 in my XJs at time. I had no issues. They recently introduces 10w30 T6 or full synthetic. I...