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Any GTX users? #4077628 04/23/16 06:39 PM
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SR5 Offline OP
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The first oil I ever used was Castrol GTX 20W-50, back in the day. With time I moved on to bigger and better things, Penrite oils, full synthetic oils, etc.

Being a belts and braces sort of guy I have been using a lot of full synthetics (Castrol Edge, Shell Helix Ultra, Valvoline SynPower) with name brand semi-synthetics as my base level oil for some applications.

Anyway last week I went back to basics and put some Castrol GTX in my car. The owners manual specs a 15W-40 A3/B3, so that is what I used, GTX 15W-40 API SN ACEA A3/B3. This is the first time I have used GTX for an oil change in about 15 years.

Yesterday, I went for 8 hour drive through the mountains with my son, and the car was running smooth and well. Given the modern specs, this is not the GTX of long ago, but the modern inheritor of the old crown, at an excellent price point.

Lots of talk about PAO and GTL, but going back to GTX was like bumping into an old friend who is happy and doing well.

Is anybody else out there using old school GTX and enjoying it ?


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Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: Any GTX users? [Re: SR5] #4077634 04/23/16 06:43 PM
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NHGUY Offline
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GTX is overpriced and overhyped.Since the 70s its been the oil for smaller-higher revving engines... Of course back then Quaker state was having recalls due to anti friction additives being left out,and Pennzoil was sludging engines....and ARCO Graphite was plugging filters....lol

Re: Any GTX users? [Re: SR5] #4077640 04/23/16 06:46 PM
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Nick1994 Offline
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I maintain a lot of my family's vehicles. I have Castrol GTX SynBlend running in the 2002 Chevy Trailblazer, and my mom's 2003 Buick Rendezvous. My brother is running it in his 1996 Lexus ES300.

I have no problems with GTX, have used it for quite some time.

To be honest the only reason I'm using it is because I got quite a bit of it on clearance for $1 per quart...


2015 Hyundai Genesis 5.0L 57k Mobil 1 5w30 & Wix
2000 Toyota Camry 2.2L 236k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 150k Mobil 1 HM 10w40 & Fram Ultra
Re: Any GTX users? [Re: SR5] #4077650 04/23/16 06:52 PM
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AirgunSavant Offline
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It still shows up highly ranked against many premium oils according to several sources including Amsoil graphs and testing as well as many others.

Its better than many would lead you to believe.

Re: Any GTX users? [Re: SR5] #4077659 04/23/16 07:04 PM
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Silk Offline
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It's always the cheapest name brand oil here, and I will get GTX 20w50 if I need it and it's on special. I haven't used it in the bike since it went SN, didn't really trust the ZDDP after that, no matter what they said. But for a car, it's which is cheaper, GTX or Penrite?


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Any GTX users? [Re: SR5] #4077670 04/23/16 07:17 PM
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Panzerman Offline
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No oil turns blacker quicker than Castrol GTX in my engines. Don't know if that's a good thing or bad thing. Leads me to change sooner because it always freaks me out.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: Any GTX users? [Re: SR5] #4077675 04/23/16 07:21 PM
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aquariuscsm Offline
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GTX 20W50 was the very first oil I ever bought on my own. I used it in my 1987 Olds Trofeo. Sold it with around 350,000 miles. Still ran smooth as silk,used no oil,and leaked no oil. Always gets great uoa's.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 0W20

Re: Any GTX users? [Re: SR5] #4077678 04/23/16 07:23 PM
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Shannow Offline
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Mum and Dad's R16 got to 380,000km on it and then some ...odometer stopped working at 380k, so don't know where it went after that.

I used it from time to time, but not currently.

Re: Any GTX users? [Re: SR5] #4077680 04/23/16 07:28 PM
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dlundblad Offline
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It agree on the over-priced comment. It was a very popular oil back in the day here (just watch any old car movie and you'll see GTX memorabilia everywhere.) so I think that mentality has just carried over.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Any GTX users? [Re: SR5] #4077697 04/23/16 07:44 PM
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Bud_One Offline
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It's been a couple of years since I've used it last.
Wouldn't mind using it, if I can ever find it on the cheap.

Last edited by Bud_One; 04/23/16 07:44 PM.

20 Pilot LX - Factory Fill
14 Civic LX Sedan- Castrol Mag 0W-20,XG7317
05 Chevy Crew Cab 2500HD- QSUD 10W-30,PF61E
97 Accord EX Wagon- Napa PPSB 5W-30,Napa 21334
Re: Any GTX users? [Re: SR5] #4077706 04/23/16 07:55 PM
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mclasser Offline
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I used it a few times in my old Hyundai. Worked fine; no complaints.


2018 Hyundai Elantra VE
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: Any GTX users? [Re: SR5] #4077785 04/23/16 09:53 PM
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Pretty much all I used for years in 10w30 flavor, year round in everything I owned. Never a problem. I figured if it was good enough for the police department (that is what they used, and still use here) I figured it was good enough for me.

Now I am much more sophisticated (right) but I still wouldn't hesitate to use it especially since they ditched the sodium add pack a few years ago.

I still currently use a lot of Castrol products but tend to buy their blends and full syns these days.


2018 VW Passat GT VR6 - 24k - Castrol Pro OE 5w40 - VW OEM filter
2012 KIA Sedona 106k - Valvoline Maxlife 5w30
2012 VW Tiguan 106k - Castrol 0w40
2004 Jeep Grand Cherokee, gone but not forgotten.
Re: Any GTX users? [Re: SR5] #4077790 04/23/16 10:02 PM
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hpb Offline
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I have a bottle of that same GTX 15w40 in my shed, bought a 5.5 litre container of it on sale a few weeks back. Was going to use it in my AU Falcon, but I'm upgrading to a 2006 BF Falcon next week, so I'll save it for that smile


MY16 Mitsubishi Outlander 2.2 diesel, 66,000km - Gulf Western Euro Energy 5w30, Mitsubishi filter
2006 Ford Falcon 4.0, 153,000km - Valvoline Engine Armour 15w40, Ryco filter
Re: Any GTX users? [Re: SR5] #4077818 04/24/16 12:21 AM
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FordCapriDriver Online Content
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i used to run GTX during the 80s, it was very good oil if not the best of the 20w50's, but have stopped using it since Castrol don't reccomend it for any flat tappet engine since they've reduced the zddp to around 600, i'd rather use VR1 nowadays


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Any GTX users? [Re: hpb] #4077837 04/24/16 01:54 AM
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SR5 Offline OP
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Originally Posted By: hpb
I have a bottle of that same GTX 15w40 in my shed, bought a 5.5 litre container of it on sale a few weeks back. Was going to use it in my AU Falcon, but I'm upgrading to a 2006 BF Falcon next week, so I'll save it for that smile


hpb, what oil change interval are you doing with the GTX 15W-40 in your Falcons?

I haven't decided yet. Maybe 12 months and 10,000KM (6000 mi) at the most, but also thinking maybe a bit sooner.


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Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
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