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Originally Posted by Paul
The last I checked the stock IMS rear bearing is not lubricated by engine oil.
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It's not supposed to be, but the theory is that engine oil gets inside the IMS tube and washes away the "sealed" lubricant, thus leaving engine oil to lubricate the bearing (however, without sufficient flow to carry away deposits, hence why it is argued that more frequent changes are good).
Modern Mobil 1 is not what it used to be. IMHO, there are better oils out there.
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