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Answer by Pᴀᴜʟsᴛᴇʀ2 for What does the "HD" stand for in SAE HD-30 oil?

It says it just above the numbers:

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Answer by Solar Mike for What does the "HD" stand for in SAE HD-30 oil?

HD stands for High Detergent. At least in the “normal” rating of oils.Usually used for diesel engines to help keep them clean.Not a good idea to use in gas engines as it can clean the bores of old...

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What does the "HD" stand for in SAE HD-30 oil?

I'm not sure if this is still the SAE 30 oil. Does the "HD" stand for "Heavy Duty" or High Detergent? Thank you!

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Answer by Vince for What does the "HD" stand for in SAE HD-30 oil?

"HD" on sae 4 cycle motor oil labels stands for "high detergent". It is a better oil to use on a new small 4-Cycle engine as it will help to keep the engine cleaner and run smoother longer. The only...

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