Thread: Synthetic Oil
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Old 07-23-2019, 02:57 PM   #33
Werner
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Location: Germany, near Aachen
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Default Re: Synthetic Oil

That depends on the amount of acid introduced. Short drive distances are very bad, long distances with oil temperatures >100 C are always good. An exact guideline can not be given for an A-engine, because these old engines have a bad combustion with many incompletely burned fuel residues. (Ethanol residue is bad!)

In large engines, oil samples are taken and the TBN is measured. A reading below TBN 2 (origin 5.5, for example) indicates that the corrosion protection has been used up.

In a classic car engine with oil filter, I would recommend an annual change interval. Our A engine due to the dirt removal max. 1000 ml. No matter which oil is filled in.
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Ford Model A Roadster, 1928
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