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I just bought an older M-B 300D Turbo. These engines run north of 300,000 miles without overhaul on a regular basis. The manual says a 5000 mile OCI is recommended. It holds about 7 quarts of oil and has a huge oil filter (that costs $15-20). If I stick with conventional oil, can I do oil...

I've had my eyes open for some non CJ-4 oil for my water cooled bike. All of the UOA's that convinced me to use this oil were under the old spec with the high ZDDP levels. In reality, the CJ-4 will probably work just fine but I would like to stock up on the tried and true CI-4 if at all...