I never really thought of a "expired oil" but I guess it makes sense from what ya'll say.

I'm in no danger since i change my oil once a year which is about a 3,000 mile oil change.

 

I just remembered, only a couple of weeks ago I went out to look at a Honda CBR600RR track bike. When I arrived, the bike barely started, didn't want to idle, and was blowing a ton of white smoke. The seller said it's never done it before, and said it must be old gas as he hasn't touched the bike in years. I looked inside the tank and saw some residue floating in the gas and on the walls of the tank. The seller said that he might have even put wrong gas in there that was mixed with oil for his lawn mower. Either way, I've decided to pass on the bike, and a few days later the seller contacted me that he took it to a shop, they confirmed that it was old gas, cleaned up the tank and the bike ran perfect. At that time I've already purchased another bike.

So I guess when gas goes bad, it's pretty severe. It was also causing some rust like pitting on the walls of the gas tank, so I guess it also starts to etch away the paint. I guess oil is less prone to this, but old oil inside an engine that rarely runs could be a concern.

 

Use in outdoor power equipment or any "I dont care for equipment". You can also talk to friends, family, or community members who can use the free oil for their own purposes, ie some houses of worship will provide free oil changes for those in need.

You could also use to lubricate hinges and other things. I would not recycle oil just cause you opened it, heck oil sits in an essentially open container in your truck for the entire OCI.

 

Yeah bad gas is very obvious, especially in FI cars and DI cars in particular.

Interestingly the more complex the fuel injection tech is the more you can get away with before the bad gas symptoms show up, carbs are very sensitive with a low threshold for errors. Difference is a carb will still sorta run, once FI is past its limit you aren't getting anything


On the topic of oil there are special blends designed for storage and corrosion protection, amsoil makes a great one that I use in my truck as it barely ever goes anywhere.

 

But then you have some oil/gas dilution, plus whatever gets absorbed into oil from combustion left overs when it circulates. Just like that old gas was etching into the gas tank walls, dissolving paint and eating into the metal, what if the oil also becomes corrosive when it changes chemical structure from whatever particles that it absorbs? Many parts of modern engines are coated with some kind of nano coatings, don't want to potentially damaged these.

I am probably overreacting.

 

Do not short cycle, if I start a car I care about it WILL see 200* oil temp and at least one 1-2-3rd gear full redline pulls or stepped rev holding at rest. I'm also very over-cautious about impurities in the oil but according to my UOAs I can easily go 3-4x as long as I do.

Modern advanced oil have resistance to exactly what you worry about and are designed for an NPC driving 5 miles to work daily and never exceed 3k rpm.....with 10k mile oil changes. The TBN index of modern stuff is insane

Those modern coatings are indeed a risk, I own no engines that rely on them. I draw the line at alusil blocks since those are homogenous and can be re-bored, any coatings past that I view as dangerous to rely on long term.