I called Castrol's tech line. They said the only change made to GC was to meet GF-4. Agree. Now if only the additive package changed, I still think this oil will show great numbers. It turns out that the PAO base oil is what made this oil good and NOT the additive package. So logically if that stays the same, I'd expect similar performance. This is my take on it. Now lets break down Mobil 1, the world's leading synthetic motor oil that commands 65% of the market.
So what do you think?
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The original GC did not meet the fuel economy requirements of GF-3 because it was a high 30 wt. If they have changed the formula enough to meet the GF-4 fuel economy requirements, then I don't think this "new" GC is going to be as robust as the old.
Well if they "thinned it out" for GF-4/fuel economy, they didn't do very much. 04 stuff is 12.1 cst@100 while 05 dropped way down to 12.0
Yes, but the only VOA I've seen posted of the gold stuff was SL rated, not SM/GF-4, and it did not have GF-4 levels of zinc and phos. If they have truly reformulated Syntec 0w30 to meet GF-4, I don't think we've seen it yet.quote:
Originally posted by shortyb:
Well if they "thinned it out" for GF-4/fuel economy, they didn't do very much. 04 stuff is 12.1 cst@100 while 05 dropped way down to 12.0
Agreed. Hope they do keep it rather "intact" in spite of the GF-4 rating.quote:
Originally posted by G-Man II:
Yes, but the only VOA I've seen posted of the gold stuff was SL rated, not SM/GF-4, and it did not have GF-4 levels of zinc and phos. If they have truly reformulated Syntec 0w30 to meet GF-4, I don't think we've seen it yet.quote:
Originally posted by shortyb:
Well if they "thinned it out" for GF-4/fuel economy, they didn't do very much. 04 stuff is 12.1 cst@100 while 05 dropped way down to 12.0
Still think this was/is an esoteric formulation and don't think it came here for fuel economy reasons. Trying to pidgoen-hole it to fit a particular task just doesn't seem what its all about. My take anyway
*dumb question* ~~> Does engine size/hp have any affect on the "decreased fuel economy" often reported by switching to GC? Meaning, would a 4 banger feel a bigger hit than a V6 or V8? I'm wondering because I'm going to switch my Grand Am (V6) soon.
I just hope my engine will rejoice.
I just hope my engine will rejoice.
I noticed no difference in mileage between factory fill, Penzoil Dino 5w-30 (SJ), 10w-30 Mobil Drive Clean (SL), GC, and 10w-30 RP (SL) in my 4 cylinder Hyundai.quote:
Originally posted by bighead:
*dumb question* ~~> Does engine size/hp have any affect on the "decreased fuel economy" often reported by switching to GC? Meaning, would a 4 banger feel a bigger hit than a V6 or V8? I'm wondering because I'm going to switch my Grand Am (V6) soon.
I just hope my engine will rejoice.
Are these the same guys that said there was no difference between the German made and the made in USA versions?
I believe the quote was along the lines of they meet the same requirements, not that they were the same.quote:
Originally posted by B00SS:
Are these the same guys that said there was no difference between the German made and the made in USA versions?
Exactly. The problem is, if you compare the two on the back of the bottle, they do not meet the same specifications.quote:
Originally posted by blupupher:
I believe the quote was along the lines of they meet the same requirements, not that they were the same.quote:
Originally posted by B00SS:
Are these the same guys that said there was no difference between the German made and the made in USA versions?
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