Originally Posted by SR5
Originally Posted by PowerSurge
All the people saying you'll have less wear with thicker oil need to show some comparative oil analysis data to prove it.
A thicker oil just reduces the probability of a wear event in the engine, it's not a guarantee of less wear in all cases. Once the metal parts are separated in hydrodynamic lubrication, job done. A thicker oil just keeps them further apart, if you think you need it for a higher stress application. The cost is more viscous drag and so a very slight hit to fuel economy.
From member Tundraotto in a previous thread, they posted a good article
LINK
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Cyril Migdal, head of global application technology for lubricant additives at the chemical maker Lanxess. "When there is less film thickness, there is a higher probability that engine parts can come into contact with each other. If they come into contact, you will have wear."
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fuel efficiency benefit comes with lower viscosity ....... a change from a 10W-40 to a 0W-20 oil, assuming identical engines, could bring up to a 3% improvement, he estimates.
It's freedom of choice, on a spectrum of: cost (fuel consumption) Vs risk (wear probability).
Ref:
https://cen.acs.org/business/specialty-chemicals/Engine-oil-becomes-critical-automakers/97/i5
Those words are great, but where are the tear down comparisons showing the ‘higher wear'. It's one thing to say "higher wear probability" and "if" they come in contact you will have wear. Let's see the tear downs. Your oil has anti-wear additives to compensate.
Engines operate with oil pressure. The parts are getting a constant stream of oil flow.