Thinner = lower MOFT ... I knew what you meant.
Will Thinner Oils Damage Your Engine?
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Thinner = lower MOFT ... I knew what you meant.
I knew what you meant too.
Yet some people still have a hard time wrapping their heads around that.Oops. Yes, sorry for the typo.
he basically said going higher on the W is not a good idea ... However he failed to mention that it depends on the ambient temp and if within that spec, it may even be a good idea to go higher on the W side. in general, the oil will have a lower amounts of VII (depending on the base oil).
I'm sure he knows that but it's hard to put all that info in a generic video.
I'm sure he knows that but it's hard to put all that info in a generic video.
He did mention that ambient temp. He said colder temps can cause oil flow to be reduced if too high of an oil wt is used.
I have read that the Mazda SkyActiv engines were designed with 0w20 in mind. I’m guessing they aren’t the only ones.
Somewhat of a misnomer on his part but I imagine he was trying to use English rather than technobabble.
Lets say you have journal bearing X under load of Y requiring a MOFT of "3" ( which comes from a 30 psi pump) with a clearance of .004"
Lets say that's with a 40 oil
Now I want to redesign it to run optimally with a 10 oil
The loads don't change and assuming the pump doesn't I have to change the L-D ratio of the bearing ( length to diameter) which in turn means usually different metallurgy, heat treatment, alloying and surface finishing to keep the same load bearing characteristics.
That gives different COF and other properties so they all have to be adjusted to work with the new MOFT per design.
That's almost certainly what he means by "better"
That's a gross simplification of a very complex design process but essentially the high points
Would the 10w30 really be any better than the 5w30 even in Florida?
Spot on.
My wife drives short trips and never pushes her compact Honda. It's filled with 0W-20.
I drive at high speeds for long periods in high temperatures. I have 0W-40 in my vehicle.
One size does not fit all.
For average people using their cars in average ways and assuming the oil is the spec by the manufacturer which is what, >90% of car owners? I'm going with "no". If you are beating the hell out of it, hooning, adding performance mods, tunes, etc. "Maybe"?
What will the 40 grade accomplish that a 20 won’t? What rpm is your engine running at these high speeds you speak of?
Will 0w-20 damage your engine not likely
Will 0w-20 make your engine last longer? Not likely
Will 0w-20 make your engine last longer? Not likely
I have almost 300,000 miles on my Accord running 5W20 and no issues.
But.....thats boring!
Generally 3.3 HTHS vs 3.1 HTHS and less temporary and permanent shear all else being equal. Add it all together and your bearings may be seeing a 2.9 vs 2.5 actual operating viscosity.
Would it be better would depend on if you had adequate operating viscosity to begin with.
That depends on which 5w-30 and 10w-30 we're talking about. A 10w-30 will typically need less VII and can make use of thicker base oils which usually means a better HTHS and lower NOACK.
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