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Old 12-30-2001, 04:21 PM
TurboTurbine
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Motor oil question

Does any one know how to tell if a motor oil is diesel rated by reading the label on the side? i think it is SJ something but am not sure. also i currently use 15-40 in my engine and wanted to go up to 20-50 because of high miles, i live in CA and have 301000mi on the engine any suggestions on the oil, normal driving conditions.
thanks

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Old 12-30-2001, 05:01 PM
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The newest designation is CH-4 (C for compression) for diesel engine oil. You can find this on the 15-w40 weights of Delvac 1300, Rotella, Chevron Delo 400, and others. The best CH-4 oils are the synthetics such as Mobil Delvac 1. These are generally 5w-40 weight.
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1984 300D Euro
1995 S320
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Old 12-30-2001, 06:09 PM
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"C" for "Commercial" and "S" for "Service"

Actually the "C" in CH-4 stands for "Commercial" and the "S" in SJ stands for "Service". It is a misconception when "C" is referred to as "Compression" and "S" as "Spark."

See publication by API at

http://api-ep.api.org/filelibrary/ACF1E1.pdf
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Old 12-31-2001, 11:41 AM
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Your right. It is easier for me to remember that Commercial means diesel engines by associating it with compression and that Service means gasoline engines by associating it with spark.

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1984 300D Euro
1995 S320
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