Question about 2001 Dodge Durango

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I have a 2001 Durango 4.7 with 131,000 miles,oil has always been changed every 7,000 with Mobil 1 synthetic. I have been reading all the nightmares about sludge with these engines, but never had a problem until now. I just changed the oil and noticed when I removed the oil filter there was no oil draining from it, the oil pressure is good but,has started tapping upon start up that last approx a couple of minutes. Any idea why oil pressure would be good with no oil getting to filter?

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Recently I have seen a larger than normal number of oil filters that are empty when removed for service. I have not cut any open yet to verify why, but I suspect that the internal drain-back valve used in many are defective and are not allowing oil to enter the filter. I would also suspect that the filter bypass valve in the filter pad could be sticking except that when the new filter is installed every one has filled normally. When doing a filter change it is always best to at least partially pre-fill the filter with oil. After the engine is running you can put your hand on the filter and if it is getting warm, the oil is going through it.
There isn't much you can do about what happened...likely you have a slight bit more wear on the bearings, as dirty oil has been re-circulating through the engine while that filter was on there, but in using a good oil, I doubt if it can even be measured. I would consider using an additive such as Lucas synthetic, or even marvel oil to help clean out the valve lifters and help with the tapping on start-up.
Oil pressure would not suffer because instead of going through the filter it is bypassing around it with no pressure drop...it's just not going through the filter.

Posted on Sep 26, 2009

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