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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Tom Savage
Vienna, WV
1984 300D Euro
1995 S320