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Castrol GTX Magnatec 5w30 #5162845 07/16/19 06:21 PM
Joined: Nov 2018
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Envoyguy Offline OP
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Hello again
I don't get on here much to post but I read all time. One thing I know is there isn't another group of people who know more about oils, and I mean that as a compliment.
On another point, I have another oil question I would like to throw out for opinions. Still driving a 2003 gmc envoy. Currently has about 145000 on the odometer. I drive probably 90% or more highway miles. Put over 20000 miles on her in a little under a year.
I use fram ultra oil filters exclusively just because I believe in them. I just changed out one that I ran for 2 oci's for about a total of 12000 miles. The " change oil" light came on about the last 1500 miles of the last fill of 5 quarts castrol gtx ultraclean 5w30 and 1.5 quarts of castrol gtx magnatec 5w30. Engine sounded smooth on this combo, though I know sound isn't everything.
Current fill is 7 quarts castrol gtx magnatec 5w30 and a new fram xg3675. I'm considering running this out to around 8k for the oil before changing but using the filter for 2 oci's again. Everything I have read on here tells me the filter is up to the task. I'm only wondering if the oil is up to that oci? I am of course considering the 7 quart sump that I'm assuming makes it fairly easy on oil.
Anyone else ran the full syn gtx magnatec that long with decent results?

Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5162889 07/16/19 06:58 PM
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ZeeOSix Offline
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At 90% highway miles I'd say any synthetic is good for 8000 miles.

Re: Castrol GTX Magnatec 5w30 [Re: ZeeOSix] #5162930 07/16/19 07:49 PM
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Envoyguy Offline OP
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Thank you....That is kind of what I was thinking. But I guess a 2nd opinion puts my mind at ease. I add up miles fast with a normal 100 miles round trip commute on the interstate with the occasional 200 mile round trip thrown in. I love my Envoy and just want to take of it the way it takes care of me.

Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5163065 07/17/19 01:51 AM
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Mad_Hatter Offline
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Originally Posted by ZeeOSix
At 90% highway miles I'd say any synthetic is good for 8000 miles.

This πŸ‘† +1

I'm gonna say the Magnatec/Fram Ultra combo will laugh at 8k miles! πŸ˜‰

Re: Castrol GTX Magnatec 5w30 [Re: Mad_Hatter] #5163101 07/17/19 04:41 AM
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wemay Offline
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Originally Posted by Mad_Hatter
Originally Posted by ZeeOSix
At 90% highway miles I'd say any synthetic is good for 8000 miles.

This πŸ‘† +1

I'm gonna say the Magnatec/Fram Ultra combo will laugh at 8k miles! πŸ˜‰


I'm with them...


19 VW Passat Wolfsburg TSI (VW Genuine 0W-20+OEM)
13 Hyundai Santa Fe Sport 2.0T (Shell RGT 5W-30+OEM)
Re: Castrol GTX Magnatec 5w30 [Re: wemay] #5163316 07/17/19 09:02 AM
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dave1251 Offline
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Originally Posted by wemay
Originally Posted by Mad_Hatter
Originally Posted by ZeeOSix
At 90% highway miles I'd say any synthetic is good for 8000 miles.

This πŸ‘† +1

I'm gonna say the Magnatec/Fram Ultra combo will laugh at 8k miles! πŸ˜‰


I'm with them...



The GTX laughs at 8K miles. The Magnatec better.


make the inside of your engine oil cap white.
don't use.
Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5163493 07/17/19 01:22 PM
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Envoyguy Offline OP
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Thanks for the feedback everyone. I'll definitely run this combo out to at least 8k. Got a good deal on the magnatec synthetic through Amazon subscribe and save. Probably just keep using it as long as the cost stays a decent bargain. I might even consider running it until the olm says time to change.

Last edited by Envoyguy; 07/17/19 01:26 PM.
Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5163606 07/17/19 03:13 PM
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ChrisD46 Offline
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My son has a 2003 Chevy Trailblazer (the twin brother of the Envoy with a Chevy badge) . I fill with M1 5W30 EP with the same Fram Ultra oil Filter for a one year OCI . Remember the oil life monitor is calibrated for 2003 conventional oil - the oil filter and oil you are using today is much better ! ...You could probably run down the oil life monitor to 0% and then reset it and run it down a 2nd time to 0% before changing the oil !


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5163631 07/17/19 03:42 PM
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Tdog02 Offline
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Under your circumstances I'd be tempted to go 10k on the oil and a filter change everytime.


09 Venza 2.7 114k 5w-30 Qsud
16 F150 2.7TT 71k 5w-30 Magnatec
Re: Castrol GTX Magnatec 5w30 [Re: Envoyguy] #5163642 07/17/19 03:58 PM
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SR5 Offline
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The Magnatec can do 8k miles.
There were some UOAs posted from an Ecoboost on Magnatec taken to 9k miles and they were fine.


---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: Castrol GTX Magnatec 5w30 [Re: Tdog02] #5163668 07/17/19 04:37 PM
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Envoyguy Offline OP
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That's probably doable. The olm seems to go about 11k give or take before it goes off. I went through one complete oci and most of a 2nd one before it said time to change. I just ignored it until I changed the oil and filter at which time I reset it.

Re: Castrol GTX Magnatec 5w30 [Re: SR5] #5163749 07/17/19 06:22 PM
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Mad_Hatter Offline
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Originally Posted by SR5
The Magnatec can do 8k miles.
There were some UOAs posted from an Ecoboost on Magnatec taken to 9k miles and they were fine.

Here πŸ‘‡..9k miles on Magnatec 5/30 and the UOA great.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4118200/Re:_13_F150_Ecoboost,_Magnatec

7.1k miles
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3839330/Castrol_Magnatec_5-30,_7100mil

Another threadπŸ‘‡ on Magnatec, Edge and GTX. All with good VOA/UOA's...

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3839330/Castrol_Magnatec_5-30,_7100mil

Last edited by Mad_Hatter; 07/17/19 06:24 PM.
Re: Castrol GTX Magnatec 5w30 [Re: Mad_Hatter] #5163765 07/17/19 06:42 PM
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Envoyguy Offline OP
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Thanks Mad_ Hatter..those were some pretty good looking uoa's especially considering they were on an ecoboost. I'm guessing I don't have anything to worry about. I'll probably just follow the olm and see how far it goes. Mine obviously doesn't have any turbo so the oil should be good for my application.

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