Automotive Engineer David Chao once and for all explains exactly how often you should change your oil and oil filter - based on engineering principles. Davi...
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Need Help? Ask a mechanic online, 24 hours a day here: https://tinyurl.com/24-7-mechanicIn this video we'll talk about Kirklands Motor Oil, who makes it and ...
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Excellent, simple oil video for laypeople.
The point of
engine oil changes needs to be driven home that change interval is based on contamination load - NOT the quality of the oil. Amsoil et. al. are on the wrong track advertising 25,000 mile engine oil when oil has to be condemned for changout @ 5,000 miles due to soot, water, unburned gas, dirt past air filter, and so on.
ESPECIALLY for modern sensitive engines with insufficient oil supplies to certain areas (*ahem*) and tiny pilot valve orifices for hydraulic technogizmos like VVT and MDS.
And so - a good quality API Group III synthetic is all that is needed for adequate, low wear when changed every 5,000 miles. I use PUP myself, a Group III+ base oil, on all non-Hemi automotive gasoline engines.
*end rant*
Edit Add: unless you want to get UOA on a timely basis every 1,000 miles past 5,000 mile oil run time. This will tell when oil is saturated, with a lab with enough test info.
When I was with Mobil, I did this experiment using the Mobil lab, which had access to all their internal oil recipe contaminant limits. My engine was flagged with excess silicon (ingested dirt past the air filter) @ ~ 14,000 miles.
I used an all PAO (before Group IV was defined) Mobil engine oil to ensure max base oil life to take the oil type out of the condemnation criteria. This was also before engine hydrualic gizmo-itis that are sensitive to deposits. This ancient personal field test confirms what we know today - use a good quality Group III engine oil and a low restriction large oil filter every 5,000 miles. 10,000 miles is absolute upper limit.