best 15w-40 oil and filter for dmax? - Page 21 - Chevy and GMC Duramax Diesel Forum
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Old 04-01-2011, 12:26 PM   eBay Motors  #201 (permalink)
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Yes, it's CI-4 and CJ-4 rated, in addition to several other ratings. It will work Excellent in your 06 or a 08up truck.

Rotella T6 Info











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Old 04-01-2011, 11:10 PM   eBay Motors  #202 (permalink)
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doesnt the oil start thick and thin up when it gets warm??? so a 5/40 would be thickest at start @40 then thin up to 5 when warm, a 15/40 would be 40 at start then thin to 5. the higher the weight the thicker the oil hence gear oil being super thick and 75-90. am i not correct on this??
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Old 04-02-2011, 06:29 AM   eBay Motors  #203 (permalink)
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yes but u cant associate the numbers like that,


The first number in the oil weight represents the oil's viscosity at 0 degrees F. The lower the first number in an oil's weight, the thinner it is at low temperatures. Oil that is thinner at cold temperatures is typically better suited for winter driving.

Second Number



The second number, the number after the W, represents oil's viscosity at 212 degrees F. The higher the number, the thicker the oil will stay at high temperatures. Thicker oil at high temperatures is better for summer driving.
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Old 04-02-2011, 11:02 AM   eBay Motors  #204 (permalink)
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theoretically i'm understanding it as I think we all have but in essence it is contradicting itself. so at start up its at 5w and at 212 degrees its 40w. in essence its thinner when its been sitting and cold and thicker at hot temps. just seems contradicting to me.
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Old 04-02-2011, 03:01 PM   eBay Motors  #205 (permalink)
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Quote:
Originally Posted by Draz View Post
doesnt the oil start thick and thin up when it gets warm??? so a 5/40 would be thickest at start @40 then thin up to 5 when warm, a 15/40 would be 40 at start then thin to 5. the higher the weight the thicker the oil hence gear oil being super thick and 75-90. am i not correct on this??
No.

Multi-Viscosity oil is rated in correlation to temps of operation with the cold viscosity first/Warm Viscosity second.
So, a 15W-40 is a 15Weight during cold operation(startup) and 40 Weight at "normal" operating temps.
That's why a 5W-40 is MUCH better for startup protection by reducing the time until oil gets to moving parts.


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07' Chevy Silverado HD
--CC, SB 4X4 Duramax Diesel/ 6 spd Allison Auto (PTO high idle mod)
--EFILive by KB3MMX Tuning W/ SDP Towing Twins (Billet S475 over Stock)
--SILVERLINE 4" Stainless Exhaust
--AMSOIL Synthetics and filtration bumper to bumper, including Bypass
--DDM tuning HID's in Low and High Beams, 6000K Lows/4250K Highs
--PPE rear Diff cover, PPE Deep Trans Pan, PPE High Flow Manifolds and Up Pipes
--Danville 3" Y Bridge and big air intake kit / EGR delete
--Airdog II DF200 w/ CAT UHE filter upgrade...etc,etc...
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Old 04-04-2011, 01:13 PM   eBay Motors  #206 (permalink)
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so really, you should be able to run 5w 40 all year round since 5w40 and 15w40 will act the same once warmed up. Correct??
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Old 04-04-2011, 02:09 PM   eBay Motors  #207 (permalink)
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Quote:
Originally Posted by BlackBetty06 View Post
so really, you should be able to run 5w 40 all year round since 5w40 and 15w40 will act the same once warmed up. Correct??
Yes




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07' Chevy Silverado HD
--CC, SB 4X4 Duramax Diesel/ 6 spd Allison Auto (PTO high idle mod)
--EFILive by KB3MMX Tuning W/ SDP Towing Twins (Billet S475 over Stock)
--SILVERLINE 4" Stainless Exhaust
--AMSOIL Synthetics and filtration bumper to bumper, including Bypass
--DDM tuning HID's in Low and High Beams, 6000K Lows/4250K Highs
--PPE rear Diff cover, PPE Deep Trans Pan, PPE High Flow Manifolds and Up Pipes
--Danville 3" Y Bridge and big air intake kit / EGR delete
--Airdog II DF200 w/ CAT UHE filter upgrade...etc,etc...
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Old 04-04-2011, 02:20 PM   eBay Motors  #208 (permalink)
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Quote:
Originally Posted by Draz View Post
theoretically i'm understanding it as I think we all have but in essence it is contradicting itself. so at start up its at 5w and at 212 degrees its 40w. in essence its thinner when its been sitting and cold and thicker at hot temps. just seems contradicting to me.
Yes but what ties it all together, is what BlackDeath said, the unit of measurement is at a certain temp.
Viscosity measurement takes temperature into account.

Let me explain. A 5W rating at 0f is a 5weight oil however if you heat that exact rated oil to 212f, it will be much thinner and might be a 0w if tested at 212f.
Now, if a 40W oil that was rated at 212f was brought down to 0F, it might be actually a 60W if measured at that temperature.

The way oil companies can manipulate viscosity ranges in a Multi-vis oil is through the additive package, containing Viscosity Index Improvers, etc.
What also seperates oils is whether it's Synthetic or Conventional and that changesis the need for these viscosity improvers. A synthetic oil requires less of the additives because it's more stable than a conventional oil due to more uniform carbon chains.



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========================
07' Chevy Silverado HD
--CC, SB 4X4 Duramax Diesel/ 6 spd Allison Auto (PTO high idle mod)
--EFILive by KB3MMX Tuning W/ SDP Towing Twins (Billet S475 over Stock)
--SILVERLINE 4" Stainless Exhaust
--AMSOIL Synthetics and filtration bumper to bumper, including Bypass
--DDM tuning HID's in Low and High Beams, 6000K Lows/4250K Highs
--PPE rear Diff cover, PPE Deep Trans Pan, PPE High Flow Manifolds and Up Pipes
--Danville 3" Y Bridge and big air intake kit / EGR delete
--Airdog II DF200 w/ CAT UHE filter upgrade...etc,etc...
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Old 05-28-2011, 08:13 AM   eBay Motors  #209 (permalink)
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Just giving this thread alittle bump and going to ask my question here instead of starting a new one.

Anyways Im about to do a oil change and I already have a 5L jug of rotella t6 and I was wondering if I just get another rotella or get some 15x40. Is it possible to mix oil weight like 5x40 and 15x40 without screwing anything up?

Im the way of thinking that 5x40 was for winter and 15x40 was for summer but a few posts back tells me other wise.

cheers
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Old 05-28-2011, 08:46 AM   eBay Motors  #210 (permalink)
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Quote:
Originally Posted by titch-- View Post
Just giving this thread alittle bump and going to ask my question here instead of starting a new one.

Anyways Im about to do a oil change and I already have a 5L jug of rotella t6 and I was wondering if I just get another rotella or get some 15x40. Is it possible to mix oil weight like 5x40 and 15x40 without screwing anything up?

Im the way of thinking that 5x40 was for winter and 15x40 was for summer but a few posts back tells me other wise.

cheers
Any reason you use an "x" instead of a "w"?
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