10w-30 questions

[austin.chatt]

I know all of that, and was talking simply 5w-30 vs 10w-30. The concept of running 10w in these cars because 5w is hard to find, just doesn't make a lot of sense to me. I personally run Penn Plat 5w-20 and will change once a year (low mileage).

There were quite a bit of people in the SVT forums talking about the 11-14s and how the 10-30 is essentially the best they tested. 5-30 to 5-50 had high shearing.

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[EFI]

There were quite a bit of people in the SVT forums talking about the 11-14s and how the 10-30 is essentially the best they tested. 5-30 to 5-50 had high shearing.

That's more a function of the brand rather than the oil rating itself. It's true that a wide range oil has inherently more shearing than a narrow range oil due to the additives that give it that range. But also some oils are better than others at shearing.

I bet a 10w30 run of the mill synthetic will shear more at high temps than a high quality 0w40 like Amsoil, Motul, M1, LiquiMoly etc.

 

[shogun32]

The concept of running 10w in these cars because 5w is hard to find

really? 10wXX is hard to find by comparison. You can find 5wXX everywhere.

 

[austin.chatt]

really? 10wXX is hard to find by comparison. You can find 5wXX everywhere.

Not for me. Walmart and every auto place near me has 10w-xx. 5w-40 and 5w-50 arent anywhere near me, and if they are, they’re for European cars and $10/qt.

 

[austin.chatt]

That's more a function of the brand rather than the oil rating itself. It's true that a wide range oil has inherently more shearing than a narrow range oil due to the additives that give it that range. But also some oils are better than others at shearing.

I bet a 10w30 run of the mill synthetic will shear more at high temps than a high quality 0w40 like Amsoil, Motul, M1, LiquiMoly etc.

I agree about the whole quality due to brand. I was considering Valvoline since they offer a high mileage and synethic blend 10w-30, but according to their product data sheets, their 10w-30 has a lower viscosity index than 5w-30. Wouldnt that be implying the 10w-30 is thinner? I dont see how their same line of the same brand’s 10w-30 could be thinner than their 5w-30.

 

[austin.chatt]

I agree about the whole quality due to brand. I was considering Valvoline since they offer a high mileage and synethic blend 10w-30, but according to their product data sheets, their 10w-30 has a lower viscosity index than 5w-30. Wouldnt that be implying the 10w-30 is thinner? I dont see how their same line of the same brand’s 10w-30 could be thinner than their 5w-30.

Circled is the viscosity index. Thats what really confuses me. High mileage with MaxLife technology.

 

[shogun32]

Circled is the viscosity index. Thats what really confuses me. High mileage with MaxLife technology.

I'm lazy, how about a URL?

 

[austin.chatt]

I'm lazy, how about a URL?

https://sharena21.springcm.com/Publ...2d889bd3/dcefb479-09bd-e711-9c12-ac162d889bd1

 

[shogun32]

viscosity index is an artificial value. The only numbers that matter are measured viscosity at whatever your cold-cranking temp is (eg. -10C), 40C and 100C.

If it's a hot day and you're banging on the motor at a track day then Ford says to use a ?W50 which we know from testing sheers down to a 40 pretty damn quick. For running around town in moderate to worm climates a 10w30 will suffice. The Gen3 motor has fancier variable cam timing and I don't know how sensitive the mechanism is to KV40 or KV100 viscosities. There's not a massive difference between 11 and 16 so a straight 10w40 shouldn't be a problem.

 

[austin.chatt]

viscosity index is an artificial value. The only numbers that matter are measured viscosity at whatever your cold-cranking temp is (eg. -10C), 40C and 100C.

If it's a hot day and you're banging on the motor at a track day then Ford says to use a ?W50 which we know from testing sheers down to a 40 pretty damn quick. For running around town in moderate to worm climates a 10w30 will suffice. The Gen3 motor has fancier variable cam timing and I don't know how sensitive the mechanism is to KV40 or KV100 viscosities. There's not a massive difference between 11 and 16 so a straight 10w40 shouldn't be a problem.

Ah, okay. So the kv100 and kv40. So essentially its only thicker at startup / cold start, and then normal operating temperatures they’re the same.

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