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01-22-2008, 07:32 PM | #1 |
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Red Line 5W40 or 10W30
Which one would be a better choice for Houston, TX weather?
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01-22-2008, 08:54 PM | #2 |
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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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01-22-2008, 08:56 PM | #3 |
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10w30
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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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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 |
01-22-2008, 10:14 PM | #6 | |||
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Quote:
http://www.redlineoil.com/products_m...=3&subCategory It's towards the very bottom: Quote:
Quote:
any help bluesubie? |
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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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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. |
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 |
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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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 |
01-23-2008, 02:14 PM | #12 |
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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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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. |
01-23-2008, 09:27 PM | #14 |
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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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01-23-2008, 09:52 PM | #15 | |
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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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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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