Question Changing engine oil before or after storage

[Joe Dutchstar]

Unfortunately many of my engrained thoughts are from many years ago. Thoughts on oil is no different.
Pre Synthetic engine oil, sludge and oxidation/contamination participating out of used oil sitting for extend periods was an issue. Consequently formed sludge in engine oil pans and other parts of the engine.
Back in the 1960s and early 70s when I had the opportunity(?) to disassemble various engines to find copious amounts of sludge build up in oil pans (back when I purchased many used cars for CHEAP) and valve trains from poorly serviced vehicles. That memory has stuck with me.
Now that we have Low Sulfur fuels and Synthetic Engine oils, these issues may be a thing of the past or at least less common.
Next oil change I am going to take a sample and let it sit for 3 months or so to see if contaminates still participate out.

 

[Neal]

Also consider an oil analysis, in fact why not just do that now?

 

[Texas Clodhopper]

Blackstone can tell you probably more than you need to know about your oil.

Oil Analysis | Blackstone Laboratories

Learn what's going on in your engine with oil analysis. Our free kits are easy to use and we explain the results in plain English! Since 1985.

www.blackstone-labs.com

 

[AbdRahim]

Unfortunately many of my engrained thoughts are from many years ago. Thoughts on oil is no different.
Pre Synthetic engine oil, sludge and oxidation/contamination participating out of used oil sitting for extend periods was an issue. Consequently formed sludge in engine oil pans and other parts of the engine.
Back in the 1960s and early 70s when I had the opportunity(?) to disassemble various engines to find copious amounts of sludge build up in oil pans (back when I purchased many used cars for CHEAP) and valve trains from poorly serviced vehicles. That memory has stuck with me.
Now that we have Low Sulfur fuels and Synthetic Engine oils, these issues may be a thing of the past or at least less common.
Next oil change I am going to take a sample and let it sit for 3 months or so to see if contaminates still participate out.

In the north country it sits for 7 months.