G-Oil 5-30, '02 VW Passat 1.8t, 1500miles

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zanzabar

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Another G-Oil UOA where wear #s look great but viscosity appears to have sheared down to 20wt territory:

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Miles on car 120,000 118,500 116,400

Miles on oil 1500 50 5000

Oil in use G-Oil G-Oil Mobil1 0-40



aluminum 2 1 3

chromium 0 0 0

iron 3 1 9

COPPER 4 2 15

LEAD 0 0 0

TIN 0 0 0

MOLYBDENUM 62 61 71

NICKEL 1 0 0

POTASSIUM 3 0 3

BORON 126 155 114

SILICON 29 10 9

SODIUM 0 0 10

CALCIUM 1823 1729 2911

MAGNESIUM 158 116 27

PHOSPHORUS 718 644 1136

ZINC 741 759 1141



SUS@210°F 55.3 57.8 no test

cST@100°C 8.86 9.6 12.62

Flashpoint°F 360 415 no test

Fuel% TR
Antifreeze% 0 0 0

Water% 0 0
Insolubles% 0.3 0.2 (ox 25, nit 10.4)

TBN 5.6 no test no test


I ran these tests to verify that it is up to the task. If G-Oil can handle a 1.8T it should perform well in practically everything. I'm mixed about these results, great wear protection, questionable service life with shearing being the main concern. I will most likely test again in 1500 miles and if wear continues to be low and visc remains above 8.0 or so I will probably keep using it.
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I had that thought too. Coolant is still showing zero though I wonder if the air filter isn't sealing well.
 
G-Oil 5W-30 being bio-ester based is a heavy 30wt oil (HTHSV 3.5cP), so the 10% KV loss is acceptable and nothing to be concerned about.

I'd run the OCI at least to 5,000 miles on this oil.
 
Flashpoint, visc, and silicon were all flagged by Blackstone. I'll take a look at the air filter and intake and see if I can find a leak.
 
Originally Posted By: zanzabar
Flashpoint, visc, and silicon were all flagged by Blackstone. I'll take a look at the air filter and intake and see if I can find a leak.


Seal for the filter in the box(if you have one), or a leak at anything post filtration or near the filter box could increase this ingestion. Any engine work done recently at all?
 
This oil does shear rapidly. It could be due to the relatively low HTHS (above 2.9 though), or fuel dilution. It does appear to be protecting your engine though. If your engine requires 30 grade, I would look for something else to run.
 
Originally Posted By: CATERHAM
G-Oil 5W-30 being bio-ester based is a heavy 30wt oil (HTHSV 3.5cP), so the 10% KV loss is acceptable and nothing to be concerned about.

I'd run the OCI at least to 5,000 miles on this oil.

Do we know this for sure? I've seen conjectures, but never official documentation as to whether this is really an "A3-type" oil or an "A1/A5-type" oil.
 
Originally Posted By: CATERHAM
G-Oil 5W-30 being bio-ester based is a heavy 30wt oil (HTHSV 3.5cP), so the 10% KV loss is acceptable and nothing to be concerned about.


Does this mean that losses in KV are not proportional to declines in HTHSV?
 
Looking at the PQIA test there are some pretty significant differences in additives: especially sodium, potassium, magnesium. Was there a formulation change recently that anyone knows about?
 
Originally Posted By: zanzabar
Originally Posted By: CATERHAM
G-Oil 5W-30 being bio-ester based is a heavy 30wt oil (HTHSV 3.5cP), so the 10% KV loss is acceptable and nothing to be concerned about.


Does this mean that losses in KV are not proportional to declines in HTHSV?

According to JAG, the loss in HTHSV due to oil shear is at half the rate as for KV100. But even if you discount that, the 10% loss in KV100 is certainly not excessive or anything to be concerned about and that appears to be the extent of the shear as I don't believe I've seen anything higher including in longer OCI in higher stess situations like the following 10,500 mile UOA from a Volvo Turbo you might find interesting:

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2596540&page=1
 
Based on this, it seems like G-Oil 5W30 may be fine for most 5W20 applications? I have it in a couple of Fords that call for 5W20, though realistically, they work fine on any oil grades from 5W20 through 10W30.
 
Originally Posted By: Zako2
Based on this, it seems like G-Oil 5W30 may be fine for most 5W20 applications? I have it in a couple of Fords that call for 5W20, though realistically, they work fine on any oil grades from 5W20 through 10W30.


A lot of 5w-20 engines also list 5w-30 as an acceptable alternative. Just check your manual. I know that mine lists it as an acceptable alternative to 5w-20.
 
Not trying to be critical, but why not run the stuff at least 5K before a UOA?
Unless you're tracking this car, or having it shipped to Europe so that you can do 200 kph for an hour at a time, I don't think 5K on any oil will hurt it.
5K would give you a better read on how well the oil holds up in your application, though.
 
Originally Posted By: fdcg27
Not trying to be critical, but why not run the stuff at least 5K before a UOA?
Unless you're tracking this car, or having it shipped to Europe so that you can do 200 kph for an hour at a time, I don't think 5K on any oil will hurt it.
5K would give you a better read on how well the oil holds up in your application, though.

5k mikes in this engine is like 15k in many other engines. It's the sludge monster.
 
I understand that this engine is known for sludge, but I can't imagine that 5K would cause any real sudge.
 
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