One aspect is that if you are looking at 5w30's the GTX is thicker at 100*C than the Supertech Synthetic is.
Castrol GTX or Supertech Synthetic?
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One aspect is that if you are looking at 5w30's the GTX is thicker at 100*C than the Supertech Synthetic is.
This is great information and thanks for the input. I wonder if the GTX 10w40 is as good as the Durablend 10w40. Castrol seems to make great oil products but I hear good things about Valvoline as well.
For me, it really depends on what application the oil is going in as to which would be better. If you are looking for an oil for one of your Volvo's i would go with castrol syntec blend. It's a little thicker than either supertech or valvoline and volvos may tend to do a little better on a heavier viscosity oil on the top end at operating temps.
Both are excellent and both use very similar additive packs. Castrol tends to blend things a bit on the thicker side. That's not good or bad, just a fact to use in your selection process.
Since someone mentioned Rotella Synthetic anyone know if they make a 5W30 only thing I see at Wal Mart in Rotella Syn is 5w40
Triple_Se7en
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If I wanted a heavier oil, I would use Rotella 5W-40 synthetic over Castrol GTX or Supertech Synthetic. My Chinamart sells it in a four quart container that breaks down to around $4.06 per quart. If the engine isn't dirty, getting 6K service wouldn't be bad - plus being diesel, it keeps things cleaner - similar to a high mileage oil.
No, I don't think the Rotella comes in 5w-30; it does, however, come in 10w-30 HD oil, found at Napa probably.
It's primarily an oil designed for diesel engines, but can and is very commonly used in gas engines without issue.
It's primarily an oil designed for diesel engines, but can and is very commonly used in gas engines without issue.
"Havoline synthetic was never highly regarded here. Had you compared the Havoline dino to something like Platinum or GC, your opinions on synthetic benefits may have changed. "
If you read Ramblin Fever's post, that was exactly his point. Just because the label says "synthetic" does not mean it is superior to a given conventional oil. The same is true of the phrase "synthetic blend". These are marketing phrases, not actual performance measurements.
If you read Ramblin Fever's post, that was exactly his point. Just because the label says "synthetic" does not mean it is superior to a given conventional oil. The same is true of the phrase "synthetic blend". These are marketing phrases, not actual performance measurements.
Ignore these replies. If supertech synthetic is such a horrible oil, why did it turn in one of the best, if not the best uoa on the site?
http://theoildrop.server101.com/forums/s...part=1&vc=1
Well, I was at Wal-Mart today and saw that the Castrol HM 5w30 is only $12.97 a 5qt. gallon and that is what I am going to go with eventually with the Supertech filter. It seems to be a great oil and both my vehicles have well over 100k miles on them. Thanks again for all the input.
Sounds like a good decision to me!
Triple_Se7en
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Sounds just like what I recommended on another thread here you started on HM oils.
Good choice!
Yes, thanks again Triple!
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