GC 0W-30 11300mi Toyota Land Cruiser 99 4.7l vs. Amsoil

[BigDz]

I have just completed a 11,300 mi run on GC and thought it would be interesting to post as I have run a couple of Amsoil 5W-30 analysis. Columns are GC 0W-30 / Amsoil 5W-30 Run#2/ Amsoil 5W-30 Run #1

Mi on Oil 11,300 / 11,500 / 12,000
Mi on unit 104343 / 93,060 / 77,000

Al 2 / 2 / 3
Cr 1 / 1 / 0
Iron 12 / 12 / 14
Copper 3 / 7 / 12
lead 1 / 1 / 2
Tin 2 / 0 / 2
Moly 1 / 3 / 4
Boron 4 / 21 / 22
Silicon 14 / 15 / 26
Sodium 4 / 5 / 5
Calcium 2486 / 2130 / 2075
Magnesium 182 / 700 / 672
Phosphorus 672 / 832 / 835
Zinc 873 / 1057 / 1010
TBN 2.6 / 2.8 / 2.6
Visc. SUS@210F 69.0 / 72.3
Insol 0.4 / 0.4

Used a Purolator Pure One Filter for all tests with a filter change at ~5500 mi. The GC was the only oil that I added 1 qt. of makeup oil. Amsoil never was down except for the makeup for the filter change. I tow a 5000lb trailer approx 1200 miles on this oil run. I also towed a slightly lighter trailer with the Amsoil over the summer. The mileage occured over 3.5 months and was probably >90% highway. In my opinion, GC is as good as Amsoil for this application. The next oil I am looking at is M-1 EP. As both of these oils made it to 11K easily, I may take a sample of the M-1 at 11K then run it to 15K. I think all of these oils can make it to 15K in my vehicle. It sure is nice not having to change oil every 6 weeks.

 

[buster]

Nice results. Both of these oils are very good and very capable. Look forward to the M1 results, which I would think look similar. These Toyota engines are just so consistant.

 

[Al]

Nice information. Almost zero difference in the results. GC=No MOly, No Boron

 

[Jay]

I'm having trouble placing the viscosity results with the right column since there are only two values given.

 

[chinee]

I'm changing the oil this weekend on my Sequioa, same engine... M1 10W30, about 9K on oil, 62K on unit... I expect the results to be as solid as yours. I usually utilize a 7.5K interval, but I misread my maintainance log and left the oil in longer by accident.

 

[TooSlick]

Allow me to nit pick ...

Since you added an extra one quart on the GC run, the numbers and oil degradation aren't directly comparable. In particular, you'd get a TBN boost of 1-2 points by adding the quart of fresh oil and the concentration of insolubles will be decreased a bit.

Having said that, the GC 0w-30 provides excellent valve train protection once again, giving credience to my crazy theory about the ASTM D-4172 test.

I can almost hear my pal Doug Hillary saying "B---er!,B---er!, B---er! when he reads this and slamming his hand on the table ...

Tooslick

 

[Tommy]

quote:

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In my opinion, GC is as good as Amsoil for this application.

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I second that .....how can you make that statement when the GC had the benefit of make up oil where the Amsoil run did not? It also begs the question: Why did one quart of the GC burn off? In the Amsoil run there was no oil consumption.

 

[Bryanccfshr]

I think that is easily answered by the fact that the GC was in when some hard towing was involved. The GC-s interval was more demanding and that towing could cause more consumption.

 

[BigDz]

Some clarification here. The amsoil had a 1/2 qt makeup with a filter change at 5500 mi while the GC also had 1/2 qt make up with the 5500 mi filter change, but also needed an extra 1/2 qt. in the second half of the 5500 mi filter run. So 1 qt total was added in the 5500 - 11000 mi run. I towed just as hard with the Amsoil and never had to add oil. Regarding the additional 1/2 qt. helping the TBN of the GC. Keep in mind that this engine has a 7 qt. sump. I don't think it helped that much to say it made a big difference in TBN. That's only 7% extra additive from the extra 1/2 qt. I still think that there really is no difference between these oils in this application. I am not saying that GC is bad, I am saying that these are both good oils. My personal opinion is to keep the $$$ in the US and buy an American product instead of supporting a foreign made oil.

I also want to note that the GC did not seem to flow any better than Amsoil or M1 5W-30 during cold start ups. It surprised me to hear my engine groan during start up at temperatures below 20F. I would have thought a 0W-30 would flow a lot better. Has anyone tested viscosity of these oils at 0 degrees F??

 

[Steve S]

quote:

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Originally posted by BigDz:
Some clarification here. The amsoil had a 1/2 qt makeup with a filter change at 5500 mi while the GC also had 1/2 qt make up with the 5500 mi filter change, but also needed an extra 1/2 qt. in the second half of the 5500 mi filter run. So 1 qt total was added in the 5500 - 11000 mi run. I towed just as hard with the Amsoil and never had to add oil. Regarding the additional 1/2 qt. helping the TBN of the GC. Keep in mind that this engine has a 7 qt. sump. I don't think it helped that much to say it made a big difference in TBN. That's only 7% extra additive from the extra 1/2 qt. I still think that there really is no difference between these oils in this application. I am not saying that GC is bad, I am saying that these are both good oils. My personal opinion is to keep the $$$ in the US and buy an American product instead of supporting a foreign made oil.

I also want to note that the GC did not seem to flow any better than Amsoil or M1 5W-30 during cold start ups. It surprised me to hear my engine groan during start up at temperatures below 20F. I would have thought a 0W-30 would flow a lot better. Has anyone tested viscosity of these oils at 0 degrees F??

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the oil is pumped it does not flow.