# Possible basic, stupid question about oil filters but would like to know

I was asking about your statement saying that a "15W" is roughly 3x thicker than a "5W".

That chart (which has been posted and discussed before) has a few oddities and errors.
isn't that why they are in multiples of 5? 0,5,10,15,20? 5x3=15? 15W is 3x a thick at 5W?

I threw a Purolator L14460 on it and adjusted the level.

It is also in Celsius not Fahrenheit as well.
There is nothing wrong with posting information in Celsius. 3/4 of the world reads its temp in Celsius, we are in the minority of reading our temp in Fahrenheit.

There is nothing wrong with posting information in Celsius. 3/4 of the world reads its temp in Celsius, we are in the minority of reading our temp in Fahrenheit.

I didn't say there was anything wrong with it, just that it was (in Celsius.)

Do you have a version in F?

isn't that why they are in multiples of 5? 0,5,10,15,20? 5x3=15? 15W is 3x a thick at 5W?

To help you out.. the W number is the "Winter" rating in API service. It has zero to do with the second number.

So its multiples don't have anything to do with it.. no.

You're welcome.

isn't that why they are in multiples of 5? 0,5,10,15,20? 5x3=15? 15W is 3x a thick at 5W?

Nope.

The number before the W is just the Winter rating for the lubricant.

The Winter rating is based on two parameters:
1. CCS - Cold Cranking Simulator - this stipulates a viscosity ceiling for a given rating to minimize the impact on cranking speed
2. MRV - Mini Rotary Viscometer - this is another viscosity ceiling but designed to confirm the oil is able to be pumped

CCS and MRV are 5C apart and are measured at the following temperatures for each respective Winter rating:
0W-xx: -35C/-40C
5W-xx: -30C/-35C
10W-xx: -25C/-30C
15W-xx: -20C/-25C
20W-xx: -15C/-20C

So, for example, on the CCS test a 0w-30 could be 4,800cP @ -35C and a 10W-30 could be 4,500cP @ -25C, at which temp the 0w-30 would be ~1,200cP. But both oils could be close to the same visc at 0C, heck the 10w-30 could actually be thinner if it's a GF-5 lube and the 0w-30 is a Euro lube.

To help you out.. the W number is the "Winter" rating in API service. It has zero to do with the second number.

So its multiples don't have anything to do with it.. no.

You're welcome.
lol you're welcome.

Nope.

The number before the W is just the Winter rating for the lubricant.

The Winter rating is based on two parameters:
1. CCS - Cold Cranking Simulator - this stipulates a viscosity ceiling for a given rating to minimize the impact on cranking speed
2. MRV - Mini Rotary Viscometer - this is another viscosity ceiling but designed to confirm the oil is able to be pumped

CCS and MRV are 5C apart and are measured at the following temperatures for each respective Winter rating:
0W-xx: -35C/-40C
5W-xx: -30C/-35C
10W-xx: -25C/-30C
15W-xx: -20C/-25C
20W-xx: -15C/-20C

So, for example, on the CCS test a 0w-30 could be 4,800cP @ -35C and a 10W-30 could be 4,500cP @ -25C, at which temp the 0w-30 would be ~1,200cP. But both oils could be close to the same visc at 0C, heck the 10w-30 could actually be thinner if it's a GF-5 lube and the 0w-30 is a Euro lube.
So, because it moves in 5C increments, its moved up or down a 5 interval in the winter rating. That makes sense. Thanks for the info, I never knew that.

So, because it moves in 5C increments, its moved up or down a 5 interval in the winter rating. That makes sense. Thanks for the info, I never knew that.

Yeah OVERKILL! I always thought the increments of 5 were just because.. "5 or over? Round up. Lower than 5? Round down." Also because it's nice and crisp.

Not quite the decimal system... .1 = 1/10th etc but something like that lol.

Nope.

The number before the W is just the Winter rating for the lubricant.

The Winter rating is based on two parameters:
1. CCS - Cold Cranking Simulator - this stipulates a viscosity ceiling for a given rating to minimize the impact on cranking speed
2. MRV - Mini Rotary Viscometer - this is another viscosity ceiling but designed to confirm the oil is able to be pumped

CCS and MRV are 5C apart and are measured at the following temperatures for each respective Winter rating:
0W-xx: -35C/-40C
5W-xx: -30C/-35C
10W-xx: -25C/-30C
15W-xx: -20C/-25C
20W-xx: -15C/-20C

So, for example, on the CCS test a 0w-30 could be 4,800cP @ -35C and a 10W-30 could be 4,500cP @ -25C, at which temp the 0w-30 would be ~1,200cP. But both oils could be close to the same visc at 0C, heck the 10w-30 could actually be thinner if it's a GF-5 lube and the 0w-30 is a Euro lube.
Thanks. Always helps to have actual facts.

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