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I would say the average grade of oil used in a Duramax is 15W40
Food grade oil
5w30
If you are referring to electrical cord that would be, Service grade Oil resistant
Depending on the climate of your region most discovery owners choose Shell Rotella T 15-40, 6 quarts. Use with a Mobil 1 Oil filter M1-204.
5w-30 grade sm or sl.
Oil was used to lubricate the vast amount of machinery used in the factories of the Industrial Revolution. It was also used for kerosene lamps, which were hugely important. The discovery of oil in Pennsylvania in the USA was a great boost to industrial production.
10w30
Use any 10 - 40 W oil. You can also use a single grade 40 W oil if the mower is old and much used.
Usually the recommended grade of oil is stamped on the oil fill cap, but it is similar to automobile oil. I use a 5w30 oil in my Suzuki.
The oil grad should be printed on the oil cap (under the hood of your vehicle).
Discuss the frequency of oil change service for a light-duty engine used in a regular service application versus on in a severe service application?