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Castrol GTX HM 5W-20 10k miles #5208108 09/08/19 10:15 PM
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Ponchinizo Offline OP
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From my brothers Chrysler 300, he ran a purolator one I believe. I attached a pic of the filter.

Screenshot_20190908-231419_Hancom Office Editor.jpg20190804_100249.jpg
Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208125 09/08/19 11:06 PM
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zeng Offline
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BStone suggesting 12500 miles ?
I would go for it .

Last edited by zeng; 09/08/19 11:07 PM.
Re: Castrol GTX HM 5W-20 10k miles [Re: zeng] #5208467 09/09/19 11:23 AM
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You think so? We were both more than a little uncomfortable pushing a syn blend so far, but this is our first foray into extended OCIs. The numbers don't lie but it just seems like a such a long run when we're both used to 5k changes.

Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208730 09/09/19 06:49 PM
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tiger862 Online Content
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Why should we spend money on Synthetic oil when conventional oil is so capable? Not a terrible report.


Tiger862
2018 Grand Caravan
Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208872 09/09/19 10:52 PM
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zeng Offline
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Stepping out of one's oci comfort zone requires confidence building , indeed.

Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208879 09/09/19 11:10 PM
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Was anything added to the virgin oil? Addy or top off maybe?

The 100c kv of virgin Castrol 0w20 HM is 8.9cSt. (range for a SAE20 is 5.6 ~ 9.3)...With the fuel dilution and the lowered flash point, I'd expect to see some viscosity loss from the virgin values either attributed to shearing and/or FD... Your viscosity actually went UP, per Cadtrol's PDS, after a 10k mile run??🤔

(unless it can be attributed to a test issue with BS)

[Linked Image]

Last edited by Mad_Hatter; 09/09/19 11:18 PM.
Re: Castrol GTX HM 5W-20 10k miles [Re: tiger862] #5208898 09/10/19 12:33 AM
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Skippy722 Offline
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Originally Posted by tiger862
Why should we spend money on Synthetic oil when conventional oil is so capable? Not a terrible report.


Castrol GTX HM is a semi-synthetic.


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208902 09/10/19 12:46 AM
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zeng Offline
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Castrol oils are generally more shear stable and typically 'thickens' (as upwards of virgin cSt) in engine oil OCI's beyond say, 10k miles.

Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208911 09/10/19 01:36 AM
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Gasbuggy Offline
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Sounds like you're getting plenty of life out of that oil, I wouldn't increase the interval.


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Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5208914 09/10/19 02:02 AM
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Mad_Hatter Offline
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Originally Posted by zeng
Castrol oils are generally more shear stable and typically 'thickens' (as upwards of virgin cSt) in engine oil OCI's beyond say, 10k miles.

Yeah, well it almost "thickened up" out of grade.. although I'd be surprised if the engine couldn't do a SAE30.

Sure, shear thickening is a "thing" as well as thickening from soot but his Insolubles% is low and the fuel dilution and lower flash point seems to indicate, to me at least, a thinning of the oil should have occurred. But I suppose it's possible to have both thinning (fuel dilution) and thickening (soot/evaporative loss-noack%) effects happening concurrently?🤔🤔

Guess this is a first for me... seeing an oil do this after a 10k run, it's 100c kv is better than the starting 100c.

Last edited by Mad_Hatter; 09/10/19 02:20 AM.
Re: Castrol GTX HM 5W-20 10k miles [Re: Skippy722] #5209117 09/10/19 09:15 AM
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tiger862 Online Content
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Originally Posted by Skippy722
Originally Posted by tiger862
Why should we spend money on Synthetic oil when conventional oil is so capable? Not a terrible report.


Castrol GTX HM is a semi-synthetic.

Conventional oil is a semi synthetic


Tiger862
2018 Grand Caravan
Re: Castrol GTX HM 5W-20 10k miles [Re: tiger862] #5209256 09/10/19 12:55 PM
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Skippy722 Offline
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Originally Posted by tiger862
Originally Posted by Skippy722
Originally Posted by tiger862
Why should we spend money on Synthetic oil when conventional oil is so capable? Not a terrible report.


Castrol GTX HM is a semi-synthetic.

Conventional oil is a semi synthetic


My point still stands. Conventional>semi-synthetic>synthetic


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: Castrol GTX HM 5W-20 10k miles [Re: tiger862] #5209308 09/10/19 01:58 PM
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JunkdrawerDog Offline
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Originally Posted by tiger862
Why should we spend money on Synthetic oil when conventional oil is so capable? Not a terrible report.

Agree. Unless you're driving some sort of problematic vehicle, conventional lubes (or semi syn, whatever) have proven themselves to 10,000 miles. No need for full syn unless you're pushing on to 15,000 or more.

Re: Castrol GTX HM 5W-20 10k miles [Re: Ponchinizo] #5209541 09/10/19 06:39 PM
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Originally Posted by Ponchinizo
From my brothers Chrysler 300, he ran a purolator one I believe. I attached a pic of the filter.


Low, low phosphorus.
Unusually high density.
Nothing else to write home about.
There must be some secret hydrocracking process or something.
What the heck is going on here ?
FWIW, Castrol puts the same low phosphorus technology in their Black Bottle EDGE HM oil.
BTW, thank you for the report.


2019 Lexus UX 250h F-Sport
TGMO 0W16
@ 32k miles




Re: Castrol GTX HM 5W-20 10k miles [Re: Gasbuggy] #5210351 09/11/19 05:12 PM
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[quote=Gasbuggy]Sounds like you're getting plenty of life out of that oil, I wouldn't increase the interval.

Agreed. Unless you are trying to set some kind of record, what’s the point of saving an extra 75 cents per month on your oil change expenses?


3.7L Ford
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