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[UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima #5192846 08/21/19 10:10 AM
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zorobabel Offline OP
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The oil in question is from the original AZ clearance some time ago. This is the second run of this oil. When I drained it, it seemed pretty dark and thick, but it sat for about 45 minutes before the OC. The sample was sucked through the dipstick with the engine hot.
The filter used was an older PL14459.
The driving pattern was mostly commuting 27 miles one way (stop and go traffic and low speed driving in hot weather) with 2150 miles worth of roadtrips.
Top-up oil was 0.5 qt.
For most of the interval, TC-W3 was added to the gas.
Two OCIs ago, I resealed the tensioner cover (Permatex Grey). There was also driving in the dust in Utah involved.

UOA Max 205k crop.pngCastrol GTX synblend.JPG
Last edited by zorobabel; 08/21/19 10:28 AM.

1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5192938 08/21/19 12:07 PM
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zorobabel Offline OP
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Forgot about this:
[Linked Image]


Last edited by zorobabel; 08/21/19 12:09 PM.

1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5193117 08/21/19 03:23 PM
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Audios Offline
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Looks about right, gotta love clearance oil changes!


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI-T6 5/40
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5195148 08/24/19 04:31 AM
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Mad_Hatter Offline
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Do you know what it's virgin 100c viscosity is? I can't find a PDS on this product. Just wondering if it thickened much over that 6k miles (it's still in grade)... doesn't look like it did. Additive levels look good. Castrols 5/30 Ultraclean (a syn blend) and GTX Syn Blend HiMi virgin are around 11.0 cSt @100c.

Nice to see a syn blend go 6k miles...

Last edited by Mad_Hatter; 08/24/19 04:31 AM.
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5195215 08/24/19 07:26 AM
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Ignatius Offline
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How old is that oil? I thought that Castrol's synthetic blend was Ultraclean?


2018 Subaru Outback Limited - 75,000 miles
2018 Subaru Outback Premium - 30,000 miles
2012 Hyundai Accent GLS - 93,000 miles
2005 Dodge Sprinter 3500 - 161,000 miles
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: Ignatius] #5196506 08/25/19 06:29 PM
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Garak Offline
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It's old enough to be a dexos1 synthetic blend at least.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5196686 08/25/19 10:10 PM
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mtgrs737 Offline
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What brand of magnetic oil drain plug is that? I have been looking for one but most are aluminum and I am not sure I trust aluminum not to strip out. I have a 2007 maxima.

Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: Mad_Hatter] #5196963 08/26/19 08:49 AM
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zorobabel Offline OP
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Originally Posted by Mad_Hatter
Do you know what it's virgin 100c viscosity is? I can't find a PDS on this product. Just wondering if it thickened much over that 6k miles (it's still in grade)... doesn't look like it did. Additive levels look good. Castrols 5/30 Ultraclean (a syn blend) and GTX Syn Blend HiMi virgin are around 11.0 cSt @100c.

Nice to see a syn blend go 6k miles...

I couldn't find a PDS myself, I might have something saved at home.
A PDS for the pre-Dexos Synblend, dated 3/20/2012 has 10.9 cSt @100C for the 5W-30 variety.

Last edited by zorobabel; 08/26/19 08:54 AM.

1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: Ignatius] #5196965 08/26/19 08:50 AM
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zorobabel Offline OP
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Originally Posted by Ignatius
How old is that oil? I thought that Castrol's synthetic blend was Ultraclean?

I purchased it in December 2014. I will post a date code photo.


1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: mtgrs737] #5196969 08/26/19 08:52 AM
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zorobabel Offline OP
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Originally Posted by mtgrs737
What brand of magnetic oil drain plug is that? I have been looking for one but most are aluminum and I am not sure I trust aluminum not to strip out. I have a 2007 maxima.

I drilled the OEM drain plug and epoxied an ebay magnet in there.


1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: Mad_Hatter] #5197319 08/26/19 03:52 PM
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SR5 Offline
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Originally Posted by Mad_Hatter

Nice to see a syn blend go 6k miles...


Yes and it looks like it did it easy. Only 4 ppm iron wear, TBN at 2.9 and viscosity still in grade at 11.5 cSt.

Nice report OP ! And the Delvac 15W40 from a previous run looks good too.


---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5197557 08/26/19 08:04 PM
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addyguy Offline
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TBN seems low on the Delvac for only 6k on a gas application, but it did well.

Any Castrol syn-blend UOA I've ever seen has been really good, they have this product well dialed-in.


2010 Kia Soul 2U - 2.0L I-4, auto; 152k miles.
Castrol Edge (black bottle) 5W-30; Fram TG 9688.

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: mtgrs737] #5197729 08/27/19 06:28 AM
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Originally Posted by mtgrs737
What brand of magnetic oil drain plug is that? I have been looking for one but most are aluminum and I am not sure I trust aluminum not to strip out. I have a 2007 maxima.


Try This ... they are the "gold" standard :o)

Honestly, if you strip anything out, you could only hope its the drain plug, as that is an easy fix compared to the oil pan.
If someone does strip it, they have no business working on a vehicle.


14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: zorobabel] #5199299 08/28/19 07:55 PM
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dave1251 Offline
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It looks good and boring. 7.5K miles will be a nice OCI given your driving habits.


make the inside of your engine oil cap white.
don't use.
Re: [UOA] Castrol GTX Synblend 5W-30 - 5980 miles - 97 Maxima [Re: dave1251] #5199397 08/28/19 10:09 PM
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zorobabel Offline OP
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Originally Posted by dave1251
It looks good and boring. 7.5K miles will be a nice OCI given your driving habits.

7.5k would probably be fine. I plan 7.5k miles for the Valvoline MST 5W-40, once the GTX synblend is finished (in about 12k miles).
Here's the Synblend date code.
[Linked Image]


1997 Maxima 210k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 211k, Valvoline SynPower 5W-30, K&N HP-1003
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