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In retrospect, I should have used the term worn. If too much fuel is in the oil, shouldn't the OCIs be shortened? The labs that analyze used oil determine how much fuel is in the oil. Wouldn't that be a good idea to do for the neighbors you mention?

The amount of gas in oil is measured by the labs as a standard procedure, IIRC. If the amount of gas in oil is above a certain amount, the vehicle owner should shorten the OCIs or find out why there is too much gas in oil.

Did the lab test indicate the amount of fuel in the oil being acceptable? If not and there is nothing wrong with the fuel injection system, it shows oil change intervals need to be shorter.

Send off some used oil to one of the labs that do oil analysis. The analysis will tell you if you have excessive fuel dilution, which can be caused by a leaky fuel injector or too long oil change intervals.

Recall what HPL typically goes for either 1 quart or a container of 5 quarts?

I say CLP is too thin for the slide of a 1911.

@RDY4WAR : Thanks. That engine looks like new.

I remember a person opined on anther forum grease shouldn't be on a 1911. Is that true? Maybe grease is good for the summer but not the winter? I thought about trying a thin coating of grease on the rails and locking lugs of my 1911. The grease I have is Hoppe's.

Interesting post. What is an example of a low quality oil and high quality oil referred to in your post? I'm under the impression conventional oil cleans better and keeps seals more pliable than synthetic oil. OTOH, synthetic shears less. Not sure if I'm right, though.

Consider 0W30 or 5W30. I'm surprised the manual calls for 0W20 rather than 5W20. NY isn't quite the arctic.

This is especially important with today's vehicles using more flexible rings. Also, direct injection if applicable.

Maybe there is a general rule of thumb.

I never knew whether high mileage oil worked or was a gimmick. Maybe somewhere in between?

Are you sure it is better to run thicker oil at 260f rather than the manufacturer's suggested weight at 210f? IOW, is it worth the increase in temperature?

Did the owners manual say you could use 15W50? I'm surprised you didn't try 10W40 first.

What is ROW?

Why 5W-30 instead of 10W-30 or 5W-40 now that it is older?

@SR5 : I didn't know 20W60 oil existed for cars.

What's a typical range of miles on a common vehicle there where people start noticing oil consumption?

There must be a way to check oil temp. I think with motorcycles there are oil temp gauges on aftermarket dip sticks.