Would not use synthetic of any type in any engine, number of Duramax and Cummins drivers I know also feel that synthetic oil in their engines leads to higher consumption/leaks. Several went back to DelVac/Rotella and their problems cleared up. I've never used synthetic in any of mine, as I'm not a believer, running Rotella in Cummins since '04, now at 187k have had no problems, uses absolutely none, does get black quickly.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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