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>I never see mud accumulation in engines which have been in use. I think the engine vibration breaks these up and the airflow blows it out. Grime made of oil and dirt is certainly a problem, however. I see a lot of oil coolers which need to have their airflow passages cleaned out. > My '63 Notch engine was the dirtiest I have ever seen on a driving car. Imagine driving on dirt roads for 10-15 years with leaky oil cooler seals and a leaky oil pressure sender. At least 40% of the case was caked with a combination of mud+oil but the cylinder fins and oil cooler still remained relatively clean. On the other hand, my '55 Kombi had a very minor oil cooler seal leak. After a couple years of driving it in AZ, the fins had a thin layer of oily dust. After the fix, my oil temps. dropped via my unscientific grab-the-dipstick method. The oil cooler was clean.