Is my math wrong on this?

slomo

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$3.21 at wally's china mart.

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bertsmobile1

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1/3 to 3/4 the price of nearly everything is advertising and marketing ( or greedy mark ups )
All those TV adds + race sponsorships in every motor sport has to be paid for by YOU the end user.
Only one company blends SAE 30 mower oil down here
The brands that have no advertising are 1/3 cheaper than the ones that do advertise .
Rule of thumb is if you see an add for the same product twice in any show the product is way over priced .
A single brand add can be spread across an entire product range but a single product add comes out of that product .
Thus down here we get endless adds for overpriced SUV's but almost none for small economy vehicles .
A 15 sec add in prime time is $ 30,000 so you need to sell a lot of oil to cover those costs .
 

PTmowerMech

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Question: Using 10w-30 as an example.

Does the oil flow better at 10 or 30?

When it heats up, it flows better. Heated up oil's viscosity is 10 or 30?
 

bertsmobile1

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People get very confused with the multi grade ratings
the first number is the viscosity at room temperature ( 20 C )
The second is a COMPARATIVE flow rate at 100 C ( or there abouts )
So what 10W 30 does
at start up it flows the same as 10 oil at room temperature
So a 10 W 30 will flow faster & easier than a 30 oil at start up
At operating temperature they should flow exactly the same

Naturally at operating temperature the oil will be thinner & flow easier .

People got the advertising B S when multi grades first came out saying they get thicker as they get hotter
This is totally BS , unless it s full of egg whites .
What multi grades do is get thinner slower as the temperature rises

The flow rates are measured in centipoise / second
IF you troll around you will find viscosity GRAPHS that will make it a lot clearer
 

PTmowerMech

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People get very confused with the multi grade ratings
the first number is the viscosity at room temperature ( 20 C )
The second is a COMPARATIVE flow rate at 100 C ( or there abouts )
So what 10W 30 does
at start up it flows the same as 10 oil at room temperature
So a 10 W 30 will flow faster & easier than a 30 oil at start up
At operating temperature they should flow exactly the same

Naturally at operating temperature the oil will be thinner & flow easier .

People got the advertising B S when multi grades first came out saying they get thicker as they get hotter
This is totally BS , unless it s full of egg whites .
What multi grades do is get thinner slower as the temperature rises

The flow rates are measured in centipoise / second
IF you troll around you will find viscosity GRAPHS that will make it a lot clearer

Many years ago, I put a bottle of mobil1 10w-30 in the freezer over night. Trying to pour it out the next day, it was like molasses.
 

StarTech

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And 5w30 Semi Synthetic is like water at operating temperature of my Briggs 330000 series engine. Pull dipstick after it has been running for awhile and you can't even see oil on the dipstick. That is why I am now running 15W50 Synthetic in it. At least I can check my oil on fuel refills with the engine hot using a black marker.

PT also about putting the oil in the freezer, many freezers are well below 32F. My chest freezer is between -20F and -10F and the frig freezer is around 10F.
 
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