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thom, if you read my posts you would see that we are largely in agreement: for example, in post 84 I suggest that for owners of the double-row bearings, the LN retrofit is the most cost-effective answer; for those with the single-row bearing, I opine that is likely also the case, although WITH BETTER EVIDENCE, I suggest that the DOF may also prove to be an important augmentation to a bearing upgrade/replacement.
We know that the dual-row bearing is more durable than the single row. We also believe that a properly engineered ceramic bearing should be more durable than a steel one. Finally, we know that inadequate lubrication is a causal factor in IMS bearing failure, regardless of the type of bearing. What we do not know is whether, especially for the single-row bearing, splash lubrication will be sufficient to ensure trouble-free, long term use. It would seem that LN are also unsure, in that they recommend replacement of their upgraded bearing every 3 years, or 50,000 miles. I wonder how many of the original sealed single-row bearings would have failed if replaced on that schedule!
Brad
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