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Old 01-22-2008, 07:32 PM   #1
Ramo
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Default Red Line 5W40 or 10W30

Which one would be a better choice for Houston, TX weather?
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Old 01-22-2008, 08:54 PM   #2
SiouxBe1
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I would say 10W-30 if it is an older Subie and 5W-30 on a newer one.
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Old 01-22-2008, 08:56 PM   #3
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10w30
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Old 01-22-2008, 09:13 PM   #4
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Well the weather changes in Houston right? If you drive hard, use 5w40 year round. If not, run a Xw30 in the winter and Xw40 in the Summer. Check your oil often.
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Old 01-22-2008, 09:21 PM   #5
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Yep, it depends on your application (car, driving conditions, mods, etc). Generally, thinner is actually ok with Redline. Their 5W20 has a higher High Temp High Shear than a lot of Energy Conserving 5 and 10W30's. Redline does not have a 5W40. http://www.redlineoil.com/pdf/4.pdf

-Dennis
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Old 01-22-2008, 10:14 PM   #6
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Quote:
Originally Posted by bluesubie View Post
Yep, it depends on your application (car, driving conditions, mods, etc). Generally, thinner is actually ok with Redline. Their 5W20 has a higher High Temp High Shear than a lot of Energy Conserving 5 and 10W30's. Redline does not have a 5W40. http://www.redlineoil.com/pdf/4.pdf

-Dennis
My car is a 100% stock '06 STI. Redline does indeed have 5W40.

http://www.redlineoil.com/products_m...=3&subCategory

It's towards the very bottom:



Quote:
Redline uses zero VII's in all but the 5w-40 and an ester base stock. This is why their oils have such high shear stability. What does this mean?
Quote:
RL 5W40 has posted exceptional UOA's on this site. No other oil has shown such consistency IMO. Search in UOA section for Tyrolkid and see what RL 5W40 did in his very HP engine. I say show any other UOA's that consistently match these.
http://www.bobistheoilguy.com/forums...Number=1044682

any help bluesubie?
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Old 01-22-2008, 10:22 PM   #7
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You're wasting money running their 5W40 on a reasonably stock motor. 10W30 is more than adequate.
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Old 01-22-2008, 11:27 PM   #8
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^^^???

Not necessarily. If he drives very conservatively, then yes maybe. But for hard driving in hot climates a "energy conserving" Xw30 is something I would avoid.
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Old 01-23-2008, 09:35 AM   #9
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Thank you, Ramo. VII's are Viscosity Index Improvers. It's what's used in an oil to give it a wider grade range. They're the first part of an oil to break down and the better oils use little or no VII's. http://www.bobistheoilguy.com/oilshear.htm

skydes - That's why Redline is like magic. Redline's xW30's are as thin as Energy Conserving oils at 100C, but their high High Temp High Shear numbers are much better than an EC oil. Their xW30's have an HTHS of 3.8. GC is ~3.6. EC oils have to be 3.5 or less and most are 2.9-3.2.

-Dennis
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Old 01-23-2008, 01:38 PM   #10
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That's interesting. I ran Redline last oil interval (10w40), I just did not want to pay $7+ a quart and drive 10 miles out of my way to get it again.
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Old 01-23-2008, 02:09 PM   #11
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Oh, I just realized the chart from bitog that Ramo posted (created by AndyH, STI owner) shows a lot of HTHS values.

-Dennis
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Old 01-23-2008, 02:14 PM   #12
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Quote:
Originally Posted by bluesubie View Post
Oh, I just realized the chart from bitog that Ramo posted (created by AndyH, STI owner) shows a lot of HTHS values.

-Dennis
Do you think rl 5w40 will be too much for houston? i have an 06 sti that's stock and drive hard when pulling onto the freeway from the on ramp
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Old 01-23-2008, 08:11 PM   #13
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^^^That is the extent of your "hard" driving? Nothing else? No weekend excursions to a twisty road or autocross?

Save your money, and just run a cheap synthetic like Penzoil Platinum 5 or 10w30 in the winter and GC 0w30 in the summer. Or you don't have to run a synthetic at all really, just run a quality dino oil like Havoline in Xw50 and you should be fine. Make sure to check your oil often.
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Old 01-23-2008, 09:27 PM   #14
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Quote:
Originally Posted by skydes View Post
^^^???

Not necessarily. If he drives very conservatively, then yes maybe. But for hard driving in hot climates a "energy conserving" Xw30 is something I would avoid.
No, even if he drives hard in a place much hotter than Houston. We're both speaking in generalities, and only a properly-read UOA can tell more specifically, but speaking from experience with a modded turbo SAAB in the deserts of southern Arizona on RL 10W30 and according to the UOAs, RL 10W30 is more than adequate and their 5W40 will waste his money.
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Old 01-23-2008, 09:52 PM   #15
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Quote:
Originally Posted by bulwnkl View Post
No, even if he drives hard in a place much hotter than Houston. We're both speaking in generalities, and only a properly-read UOA can tell more specifically, but speaking from experience with a modded turbo SAAB in the deserts of southern Arizona on RL 10W30 and according to the UOAs, RL 10W30 is more than adequate and their 5W40 will waste his money.
I run RL 10w30 and no problems here. How will RL 5w40 waste his money when it cost the same as their 10w30?
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Old 01-23-2008, 10:01 PM   #16
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^^^I think he is probably relating to the fact that you might get a bit better gas mileage with 10w30 versus 5w40.
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Old 01-23-2008, 10:27 PM   #17
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Correct-o.

As an aside, mpg often (normally) correlates better to HTHS viscosity than to kinematic viscosity @ 100C (212F)

Last edited by bulwnkl; 01-23-2008 at 10:33 PM.
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