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#2293594 - 06/21/11 09:39 AM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
mva Offline


Registered: 02/09/08
Posts: 755
Loc: Northern BC, Canada
Originally Posted By: Radman
My Nissan engines are tough on oil, therefore I have used synthetic lubricants for over 15 years. I have researched many different oils on my VQ35DE. Several years later and allot UOA’s the numbers surprised me. The run of the mill Castrol 5W30 GTX outperformed most of the synthetic lubricants. After my Mobil 0W40 stash is exhausted I will be buying the Castrol 6 gallon oil in the box. Doing the right thing needn’t cost $5+ a quart. Who would have thought that Castrol mineral oil would turn out better UOA's than Mobil Synthetic? I am now a Group 2 Convert.

Feedback would be greatly appreciated!


Would you post the links to your UOA history so we can have a look?
_________________________

2000 Toyota Sienna 318,000 km PYB 5W30
2000 BMW Z3M 110,000 km GC 0W30
2005 Prius 148,000 km VWB 5W20
2002 Civic Si 187,000 km PYB 5W20

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#2293596 - 06/21/11 09:39 AM Re: Foregoing Synthetic For Castrol GTX [Re: ARCOgraphite]
PZR2874 Offline


Registered: 05/06/11
Posts: 499
Loc: San Antonio, TX
Why is it flawed... Please explain.
_________________________
2007 Mazdaspeed 3 - 123K
2007 Forester XT - 96K

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#2293619 - 06/21/11 10:18 AM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
jstutz Offline


Registered: 10/06/08
Posts: 1472
Loc: NC
Radman, in your past, have you stuck with mostly xw30 oils or does your list of UOAs include a 5w40. I noticed you had 0w40M1 in there but not any 5w40s. I have a VQ35 and would be interested to see your UOA results if you have them all together.

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#2293622 - 06/21/11 10:22 AM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
addyguy Offline


Registered: 09/08/05
Posts: 13419
Loc: Canada
Castrol GTX is a good oil.

In the past, they used to really push that they were the oil for high shear, high heat situations in small engines. They still do, and in looking at UOA's, it seems like GTX shears just a bit less than other XW-30 oils. At least from what I can see.

When I used it, my engine used less of it that other oils.
_________________________
2003 Mazda Tribute LX V-6, 162K miles.
Oil: Edge SPT, PP, and Lucas syn; MPH2 filter.

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#2293634 - 06/21/11 10:44 AM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
Mark72 Offline


Registered: 09/10/09
Posts: 898
Loc: Illinois
Right now, I actually have a run of GTX going on my minivan..the new trishield stuff. I got it for 13.50 for the jug before they cranked it up to 18.50. Off topic…In my 95 Lumina which as 165k on it, I’m running Mobil Super High Mileage, and I have seen a remarkable reduction in fuel usage. I know it’s much better because it is VERY obvious that these Luminas suck gas in town. Almost as if someone is siphoning the gas out of your tank every time you park the thing and get back in it. It is not placebo and it is very evident my car is using less gas on this stuff. It’s the only HM oil that has the energy conserving rating. It is also a syn blend and wonder how much syn is in this stuff.

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#2293671 - 06/21/11 11:47 AM Re: Foregoing Synthetic For Castrol GTX [Re: mva]
ottotheclown Offline


Registered: 06/21/09
Posts: 2037
Loc: new york
Posting the links to the uoas you mention would permit us in #1 seeing the add packs of GTX and also#2 deciding if this oil is worth all you say. Just asking smile
Originally Posted By: mva
Originally Posted By: Radman
My Nissan engines are tough on oil, therefore I have used synthetic lubricants for over 15 years. I have researched many different oils on my VQ35DE. Several years later and allot UOA’s the numbers surprised me. The run of the mill Castrol 5W30 GTX outperformed most of the synthetic lubricants. After my Mobil 0W40 stash is exhausted I will be buying the Castrol 6 gallon oil in the box. Doing the right thing needn’t cost $5+ a quart. Who would have thought that Castrol mineral oil would turn out better UOA's than Mobil Synthetic? I am now a Group 2 Convert.

Feedback would be greatly appreciated!


Would you post the links to your UOA history so we can have a look?


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#2293686 - 06/21/11 12:10 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
ericthepig Offline


Registered: 12/26/06
Posts: 1648
Loc: Little Rock, AR
Thru the late 70s and throughout the 80s I had 4 bangers. Subarus GL & DL, and a Datsun B210 (been all Mazda (GLC, 323 and now 6) since circa 1990).

Anyway, heard the advertisement - "GTX for small high revving engines". And I was in (mostly 20w50 iirc). In the early '90s I heard "GTX 20w50 is the nearest thing to synthetic in it's properties/performance". It was like when your older brother tells you a physics "fact" when your six yrs old - it sticks as the truth regardless of how off it was. Today I still have to shake that GTX 20w50 statement out of my head.
_________________________
'06 Mazda 6 (97k) - Pennz YB 5w20 for summer (1 filter/yr)
'98 Sienna - (87k) - Pennz YB 5w30 1 yr OCI (but only ~5k miles)

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#2293700 - 06/21/11 12:19 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
VR1 Offline


Registered: 06/19/11
Posts: 132
Loc: North Texas
I know thats right ericthepig we ran 20w-50 red cap GTX in the Suzuki I enjoyed it.
_________________________
People who know use Valvoline

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#2295245 - 06/22/11 08:51 PM Re: Foregoing Synthetic For Castrol GTX [Re: lexus114]
Gene K Offline


Registered: 01/25/03
Posts: 3127
Loc: Decatur AL USA
Originally Posted By: lexus114
Originally Posted By: Mark72
This sounds like an advertisement for Castrol GTX. You guys all work for BP? smile LOL... I like GTX as well. I wish it wasn't so high priced. I know that higher cost doesn't always mean better product but sometimes I wonder what they use in their add/pack that is so special and requires such a "special" price.



We`ll never know,they dont tell you anything! It`s a big secret.


The same reason GEICO went from one of the cheapest to the most expensive. Someones got to pay for all those ads.
_________________________
Gene






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#2295256 - 06/22/11 09:05 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
Synthetics are usually better for extended oil change intervals.I used to think there was nothing better than syn oil untill I started seeing how good the GP2+ Chevron oils worked on the engines at work by 1995 I was back to dino except for the vehicles I do extended oi change on.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#2295286 - 06/22/11 09:22 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
Dominik Offline


Registered: 06/19/03
Posts: 328
Loc: Brampton, Ontario, Canada
Looking at UOAs section I have noticed that GTX holds the viscisity quite well even in engines that are known to bet oil, PYB on the other hand shears a bit more. Frankly this is the oil I would cosider to use if I wee to opt out of synthetics fo under 5K OCIs.

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#2295300 - 06/22/11 09:32 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
MetalSlug Offline


Registered: 07/24/10
Posts: 2032
Loc: Garland, Texas
I pick GTX dino oil over any other dino oil if price is not a problem. there high mile version is also exelence.


Edited by CamaroT56 (06/22/11 09:34 PM)
_________________________
If you do well in live, you got nothing to worried wink

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#2831591 - 12/11/12 03:14 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
wemay Online   sick


Registered: 04/04/12
Posts: 1005
Loc: South Florida
Using GTX 5w30 right now in my 2010 Lancer Ralliart (turbo). Going to run it 3750 miles, send off for a UOA and let you guys know the results when done.
_________________________
13 Hyundai SFS 2.0T
Spec: SM/5w30/GF-4^
3-5K oci

12 Infiniti M37
Spec: SN/5w30/GF-5
3750-7.5K oci

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#2831832 - 12/11/12 06:49 PM Re: Foregoing Synthetic For Castrol GTX [Re: Mark72]
gregoron Offline


Registered: 11/08/12
Posts: 383
Loc: Hawaii
Originally Posted By: Mark72
Right now, I actually have a run of GTX going on my minivan..the new trishield stuff. I got it for 13.50 for the jug before they cranked it up to 18.50. Off topic…In my 95 Lumina which as 165k on it, I’m running Mobil Super High Mileage, and I have seen a remarkable reduction in fuel usage. I know it’s much better because it is VERY obvious that these Luminas suck gas in town. Almost as if someone is siphoning the gas out of your tank every time you park the thing and get back in it. It is not placebo and it is very evident my car is using less gas on this stuff. It’s the only HM oil that has the energy conserving rating. It is also a syn blend and wonder how much syn is in this stuff.


Maxlife XW-30 is HM blend oil that is resource conserving and GF-5 as well. Of the 3 HM 30 oils, MS is thinnest at 100C, followed by ML, then by Castrol HM.
_________________________
2000 VW Jetta GL 2.0, 121k miles (M1 0W-40).

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#2832014 - 12/11/12 09:24 PM Re: Foregoing Synthetic For Castrol GTX [Re: Radman]
04SVT Offline


Registered: 03/19/11
Posts: 133
Loc: Texas
Hmmm, this thread has me thinking. I am just about to put some Amsoil 5w40 in my wife's maxima. Where did the OP go? I want to see some uoa of this if possible.


Edited by 04SVT (12/11/12 09:38 PM)

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