Bicycle Mechanics - FYI on chain lub

Just finished my spring maintence on my Rans Stratus. After cleaning the chain in kerosene and drying out, and before relubing, my Park chain wear tool still shows less than .75% wear after 6000 miles. The chain has always been oiled with Mobile 1 extended oil.

Straight oil or cut w/ mineral spirits to apply? What sort of riding environment? Chain make, model, and speed?
How much do you weigh?

All relevant questions. It's been pointed out many times that motor oil is an excellent lube, but meant for closed environments. If you could truly enclose your chain and keep it in a bath of the stuff, it'd likely last forever (well, not FOREVER...but many thousands of miles.

Keep up the good work. I have 9390 miles on my 7 speed tourer with a cheap KMC chain. I clean mine with Simple Green in an ultrasonic cleaner. I lube with 4pts. mineral spirits to 1 prt. chainsaw bar oil.
I have a Roloff chain checker, but when the chain gets close to the wear out point I measure it with a ruler for the 1/16" in 12" replacement point.

Just a note on your FYI: if your Rans takes 3 bike chains (a typical number I've heard for 'bents), then chain wear should be 1/3 normal. With that factor applied, you've got about 2,000 typical miles on your chain, which isn't too far outside the norm.

Measure your chain with a good ruler. A chain at 75% on a Park tool is probably too far gone. I replace just before any one foot interval reaches 12 1/16 inches. Measure three different intervals, chains do not stretch evenly.

If a Park tool shows .75%, a precision rule should always show less elongation. The Park chain checker has two major sources of error. It can report a new chain to have as much as .25% wear, which should be subtracted from future readings. It also adds roller wear to the actual elongation. The wear on two rollers can be a much as all of the pins and bushings between those two rollers - effectively doubling the reported wear.