Gas mileage

ASSISTANCE Stock Engine-Bay Components
1

To Moderator: If this is in a wrong section, please move it.

I have 90 GS with 148K miles. I did a gas mileage test for the last 3180miles on my teg. One third(~1000miles) of it was in a city mode(Dusseldorf, Germany) no heavy load in a car, and the rest was highway, speed anywhere from 45 mph (~1000miles Poland freeways) to 75 mph (~1000 miles on German autobans) with the car loaded so that there was only 1inch clearance between the top of a rear wheel and a wheel well edge (I have 195/55/R15).

So, for 3180 such miles used up 393.292 liters of gas or 104 gallons (untill the fuel tank got empty), calculated from the receipts.

It turnes out 7.68 Litres for 100Km or 30.56 miles per galon.

Also, burned two quarts of oil during that trip, and paid on average 4$ per galon of regular european 92 octane gas.

Thought someone would like to know the numbers, at leas gas mileage and the cost.

Regards,

2

The MPG numbers sound about right for a well taken care of motor. I’d like to know what you were using for motor oil. 5W40?

Regards,

Oz

3

should we use 10w40 or 5w40

4

Oz,

Thanks for the reply- I was not the original owner, purchased this car just this June so I do ot know how well taken care it was. I don’t think it was- it if takes 2 quarts of oil for 3K miles.

I used castrol 10-40 gtx, the cheap one.

My other teg, 93 GS with 68K miles does not consume any oil at all- on that one I use Castrol syntec 5W-60 that I buy bulk from Costco.

BTW, what should I do about the oil consumption- it is not leaking, I checked, and it does not smoke blue or grey from the exhaust?

Would replacing the rings do the job? Maybe higher compression pistons at the same time?

Thanks again,

5

Originally posted by stoskus
[B]Oz,

Thanks for the reply- I was not the original owner, purchased this car just this June so I do ot know how well taken care it was. I don’t think it was- it if takes 2 quarts of oil for 3K miles.

I used castrol 10-40 gtx, the cheap one.

My other teg, 93 GS with 68K miles does not consume any oil at all- on that one I use Castrol syntec 5W-60 that I buy bulk from Costco.

BTW, what should I do about the oil consumption- it is not leaking, I checked, and it does not smoke blue or grey from the exhaust?

Would replacing the rings do the job? Maybe higher compression pistons at the same time?

Thanks again, [/B]

stoskus,

There is a Costco in Germany? :think: Anyway, a compression test, wet test, and a leakdown test sounds to be in order here. If you’re going through all the trouble in replacing the rings, you might as well rebuild the motor (ie, replace seals, guides, gaskets, etc).

You can try maybe using Castrol SLX 10W50, but I still think you’ll have some oil consumption issues afterwards. I am quite surprised that you are using Syntec 5W60. In fact, I’m more surprised that 5W60 is even available at all. Do you know if the European Syntec version is Group IV/V synthetic or just regular dino oil? It is Group III dino here in North America with the highest viscosity weight of 5W50, and 20W50.

You might want to recheck your underside to see any small weepage of some kind. Even though you might not see it on your garage floor, you could still be leaking. Look for any sludge deposits forming on crossmembers, axles, and such.

Regards,

Oz

6

I use 10w30, should I use 10w40?

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Hi Oz,

Thanks for advice,

There is no Costco in Germany, I get the oil from US, when I get there on my holiday, once or twice a year. Cheapest mineral oil in Germany is almost as expensive as fully syntetic in US…

I did compression teston this problematic 90 teg, dont remember the numbers now, but it was high and all the same, and just a bit lower than on 93 teg. Have not done the wet or leakdown. I am not sure what is a wet? Is it a compression test when you pour some oil in the cylinder? I know what a leakdown is and will have to do it on day.

Shinkhi-

use 10-40 in the warmer climate, like Texas, Florida, Arizona, etc. This oil is more viscous than 10W-30, but at higher ambient temperature it is just right viscosity.

Thank you guys for response,

you could email me directly at thomas.stoskus@nokia.com

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Oz,

How to figure those oil dino groups? I have not checked the specs of european oils- just looking at the prices scared me away- 1 quart of syntetic Mobil1 is 15 bucks. I am not that stupid or that rich…

(actually, I am very proamerican, dont buy any german products, even do my underware shoping in states , too, :up: - the reason is- german government does not allow to register 2 gen integras in germany.)

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stoskus,

Yes, a wet test is the same as a compression test, but you add 1 - tablespoon or teaspoon? - of oil. It is a cheap way of verifying if your rings are bad.

Anyway, I know about Castrol Syntec being Group III because it is common knowledge in the oil industry. I have spoken with a few engineers within the industry, and they confirmed that the only off-the-shelf 100% synthetic is Mobil 1.

You should be grateful at the fact that Europe has the highest standards in Motor Oil. The ACEA - which is the North American equivalent to API - is literally years ahead in oil standardization and quality. Put it this way, all oils in North America and Europe easily meets API standards (SL and CI-4 is the latest). But very few North American oils meet the latest ACEA standards (A4/B5 I think), or even the one before it. That says a lot about North American oils. Because of this, the same oil company operates differently in both continents. Case in point, Castrol. Castrol only markets their Group IV lineup branded SLX in Europe, but not in North America. This led me to my question about the European Syntec version.

In simple terms, Europeans worry about protecting their investments (ie. engines), while the North Americans worry about how many bottles of oil they sold last month.

Regards,

Oz

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15w-40??? that stuff sounds like it should go in a deisle or something. acura recomends 10w-30 and 5w-30 for very low temps

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Originally posted by actek18
15w-40??? that stuff sounds like it should go in a deisle or something. acura recomends 10w-30 and 5w-30 for very low temps

Who said anything about 15W40?

:shrug:

Oz

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i meant 10w-40, i havent heard of anyone using this in small engines like ours

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Originally posted by actek18
i meant 10w-40, i havent heard of anyone using this in small engines like ours

I am a 40wt. convert since this past summer. You’d be surprised how the Europeans favor thick oils such as 40wt., 50wt., etc over the 20 and 30wt. that we North Americans are brainwashed into using.

Regards,

Oz