After driving for 15 min. or so w/ the engine up to temp, I have noticed that the top of my oil cooler is barely warm to the touch while the bottom is quite hot. Does this indicate a major blockage developing? If so will oil still circulate properly(just not cool well)?

The car is driven regularly and does not need to have oil added between changes. I have good oil pressure(about 1.75 bar when hot).

Mark

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85 300D (California) 220k
03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada)
03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico)
Diamondback hybrid
Element skateboard(mileage unknown)

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