We see many posters complaining about adding ANY oil between multi-thousand mile oil changes… Notice the excerpt below from a 1961 Car and Driver Review of the Jaguar XKE with the 3.8 liter six cylinder engine…
“Our average oil consumption came to one quart every 112 miles and this cannot be considered abnormal for a hard-working E-Type. Even for the 3.8 and Mk IX, the oil consumption figures are quite liberal, according to Jaguar Service. A range of 300 to 875 miles per quart is considered normal. Apparently due to the large quantities of oil being burned in the cylinders, the most frequent maintenance operation consists of cleaning and adjusting the spark plugs at 2500-mile intervals.”
Seems like you’d be adding at least 2 quarts of oil at every gasoline fill up and cleaning spark plugs 4 or 5 times a year!
Ahhh… the Good Old Days!