I am truly amazed by this oil. I have a '93 Taurus SHO that was burning oil at a rate of 700 miles to the quart. I tried some Auto-RX and it did slow the burning to 1500 miles to the quart after two treatments. But over a six month period the car returned to it's thirsty ways using Supertech and Mobil Drive Clean.
I tried some 10w30 Castrol GTX HM and the oil consumption has dropped to one quart every 2300 miles. This happened immediately.
Castrol GTX HM
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I had some good luck too on a 12 year old GM 3.1 V6 that was leaking and consuming oil. I put in the Castrol GTX HM 10w30 and the leak and consumption were almost completely gone. As soon as I put back the regular castrol dino it all started again.
quote:I'm currently driving a 3.1L GM around, but I'm using Pennzoil Long-Life 15w-40 in it. Engine previously had Mobil Drive Clean Plus 10w-40, but engine will sucking this oil down like it was a wannabe two-stroke...
Originally posted by 1maniac: I had some good luck too on a 12 year old GM 3.1 V6 that was leaking and consuming oil. I put in the Castrol GTX HM 10w30 and the leak and consumption were almost completely gone. As soon as I put back the regular castrol dino it all started again.
![[Big Grin]](images/icons/grin.gif){kind=icon}
Anyways, I made the switch over to Pennzoil Long-Life, and only have about 700 miles on since the change, but the oil is still right near the full mark...which is a VERY LARGE IMPROVEMENT over what it was doing before.
I know you guys are having good luck with the HM oils, but I'd be very curious to see how the 15w-40 HDEO's would do in comparison...Yep that GTX HM is some neat oil . I'd like to see an engine beat down that 10w-40 they have in 5k miles or so.Doubt it can be done . It's some thick stuff and no doubt far less VII's than conventional 10w-40s .
Patman used the 5w-30 for I think 6 months,,TBN was still 8 ! ![[Smile]](images/icons/smile.gif)
Someone else here ran it " 10w-30 " to almost 10k miles in a Honda engine ! Seriously , like 9600 miles and wear was great
Someone else here ran it " 10w-30 " to almost 10k miles in a Honda engine ! Seriously , like 9600 miles and wear was great 
Patman
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quote:Good memory! It was actually 7 months though, in my mom's Probe GT, and here is the UOA: http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=3;t=001016 TBN was at 8.8, and that's on the lower scale too! I probably should've stuck with this oil in her car, but I was anxious to try out Walmart 0w30 synthetic, especially since my mom does mostly short trips, so the 0w is more of a benefit to her.
Originally posted by Motorbike: Patman used the 5w-30 for I think 6 months,,TBN was still 8 !
There have been so many people who have said that this Castrol HM oil is good that I think I may try it in my lawnmower and weed trimmer (the 10W-30 Castrol HM). I used Mobil 1 this winter but maybe I will give this Castrol HM (the 5W-30) a try to see how it works.
However, even if this Castrol HM is really good oil, in the wintertime it might be better to use something that flows really good in the cold, like Mobil 1.
I run the GTX HM in my '97 3100. On regular GTX, it burns about 3/4 quart - 1 quart on a 3,000 mile OCI, but with the GTX consumption is negligible. I'm very impressed with it. It seems to run smoother and drives better with it too. I run 5W-30 in the winter (I have got it in now) and 10W-30 in the summer.
It's definately something that I recommend to all my friends with cars that are getting up there in the miles. I also run it with an AC UPF-52 filter.
Why aren't high milage oils used in newer cars? It would seem that the additive packages in these oil are superior to the additive packages in "regular" oils and would result in less wear.
quote:There is no reason not to run these HM oils in any car. The add packs are more robust, and they have a good dose of esters in them (which technically makes them "synthetic blends.") If the 5w20 wear numbers don't look too good in my Chrysler, I'm planning to use Pennzoil HM at my next oil change.
Originally posted by SSDude: Why aren't high milage oils used in newer cars? It would seem that the additive packages in these oil are superior to the additive packages in "regular" oils and would result in less wear.
quote:Probably true. The main thing is that they don't carry the API "Starburt" that many manufacturer's recommend in their owners manual. We're maybe back to the CAFE thing again.
Originally posted by SSDude: Why aren't high milage oils used in newer cars? It would seem that the additive packages in these oil are superior to the additive packages in "regular" oils and would result in less wear.
This oil is now on sale for $1.99/quart with a coupon from your Sunday paper at Kragen Auto parts.
Any more info on castrol GTX HM 10w-40 like a UOA/VOA
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