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

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Originally Posted By: fdcg27
Not trying to be critical, but why not run the stuff at least 5K before a UOA?


The engine is spec'd for 5-40 and I was just trying to make sure I wouldn't incur any accelerated wear because this oil is technically thinner than called for. Wasn't really worried about sludge. I will test again at 3k or 4k to see how it holds up.
 
G-Oil may well meet the HTHSV requirements of your engine, without regard to its SAE grade.
I'd pay more attention to TBN, not a G-Oil strong point, as well as the levels of wear metals.
If wear metals are low, then the oil is doing its job, without regard to any shearing.
Also, there was a member here, who got banned (AudiJunkie), who posted a few UOAs of engines like yours using API spec 5W-30 syns.
They looked really good.
Unless you want to run 10K+ on an OCI, a number of API spec oils would probably work well in your VW.
 
Originally Posted By: JAG
Originally Posted By: fdcg27
I understand that this engine is known for sludge, but I can't imagine that 5K would cause any real sudge.

I have the transverse and less deposit-prone version of this engine. I've used robust oils with OCIs usually less than 5k miles, sometimes 5k, and rarely more. The result was still this: http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=851589#Post851589


My car had M1 0-40 at 5k OCIs pretty much its entire life and still looked like that. Darn over-engineered PCV system.
mad.gif
 
Originally Posted By: zanzabar
My car had M1 0-40 at 5k OCIs pretty much its entire life and still looked like that. Darn over-engineered PCV system.
mad.gif


Then why did you keep using it?
 
Originally Posted By: LeakySeals
Originally Posted By: zanzabar
My car had M1 0-40 at 5k OCIs pretty much its entire life and still looked like that. Darn over-engineered PCV system.
mad.gif


Then why did you keep using it?


What, the PCV system? Because it is difficult to remove all those parts and California wouldn't be very happy with me.

If you're talking about the oil, well it's one of the best out there, so no real reason to stop using it. Plus all those oil changes were done by the previous owner. I HAVE stopped using M1 (b/c of price mostly).
 
Originally Posted By: mount
Originally Posted By: Cutehumor
can this oil handle 10k runs? the shearing is worrisome

Here's a UOA of 10K in a Volvo 850 Turbo. Extremely good wear numbers, but TBN is about shot. http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2303865#Post2303865


From that link: "Most my driving is 70-80 mph interstate with cruise set. I have an 1.45 hour, 103 mile one way drive to work 5 times a week."

I think this part should explain why this oil lasted up to 10,000 miles in that Volvo. I am guessing that for a vehicle with more typical commute distance, 5,000 to 7,500 miles would be a more realistic OCI with G-Oil. In fact, two other G-Oil UOA's for SUVs (I think a Jeep and a Ford SUV) support this notion. I am certainly not keeping it past 5,000-6,000 miles in my cars. Based on virgin and used oil analysis, G-Oil seems like a fine oil, just not good enough for very extended OCIs. Not bad for a FAR oil at all.
 
Last edited:
Originally Posted By: zanzabar
Originally Posted By: LeakySeals
Originally Posted By: zanzabar
My car had M1 0-40 at 5k OCIs pretty much its entire life and still looked like that. Darn over-engineered PCV system.
mad.gif


Then why did you keep using it?


What, the PCV system? Because it is difficult to remove all those parts and California wouldn't be very happy with me.

If you're talking about the oil, well it's one of the best out there, so no real reason to stop using it. Plus all those oil changes were done by the previous owner. I HAVE stopped using M1 (b/c of price mostly).


^This.

Oil can only do what it's allowed to. Any oil is going to be garbage in such an app with a failing/failed component or system.
 
Another sample from same G-Oil fill. 1qt topup was added at 1500 mile sample taken from drainplug on the sump.

Pretty standard G-Oil pattern developing here though, visc and TBN have dropped quickly, but wear rates appear to be very low.

Code:


Miles on car 122,000 120,000 118,500 116,400

Miles on oil 3500 1500 50 5000

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



aluminum 4 2 1 3

chromium 0 0 0 0

iron 4 3 1 9

COPPER 5 4 2 15

LEAD 0 0 0 0

TIN 0 0 0 0

MOLYBDENUM 63 62 61 71

NICKEL 1 1 0 0

POTASSIUM 8 3 0 3

BORON 118 126 155 114

SILICON 54 29 10 9

SODIUM 0 0 0 10

CALCIUM 1740 1823 1729 2911

MAGNESIUM 122 158 116 27

PHOSPHORUS 716 718 644 1136

ZINC 709 741 759 1141

SUS@210°F no test 55.3 57.8 no test

cST@100°C 8.6 8.86 9.6 12.62

Flashpoint°F no test 360 415 no test

Fuel% no test TR
Antifreeze% no test 0 0 0

Water% no test 0 0
Insolubles% (soot
TBN 2.1 5.6 no test no test
 
I'll take another sample at 5500 miles or so just to see how far the TBN drops. Not sure if I want to experiment with an extended drain on this stuff or not. It would be interesting to see how the visc and TBN do on an extended drain and when/if the wear metals start increasing.
 
I have to admit, I chickened out and topped up with 1/2qt of 15-40 diesel oil (Rotella T) because I was losing sleep at night about the visc and TBN.
wink.gif
The Passat is up to 4500 on this OCI and I plan to change it out at 5500 and will post the UOA.

Did the same on the Merc C320 (added 1qt Castrol GTX 15-40 diesel).

I understand it will skew the results a bit, but oh well.
I'll be changing the oil on that Merc sometime this winter and will run a UOA on it as well.
 
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