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Better mpg D.I. Engine = Better for the Environment?

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Old 04-19-2017, 05:35 PM   #1
Darion
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Default Better mpg D.I. Engine = Better for the Environment?

So here is the story. I have a company car, 2015, 4 cyl D.I. Equinox. Couple months back it started making racket, sounded like a clunking rattling sound at 2000 rpm. Being the company's car I just took it straight to the dealer. Service manager says, bet its low on oil, had 70k freeway miles on it no service engine light. I looked at him and said really, in 5000 miles since last oil change, he says yup, they burn oil. Im thinking I have never had this happen with a newer car. Sure enough, pulled the stick and nothing.

Next step, he says leave it so we can see if it needs to stay overnight for service, alright then, off I go. He calls me back and says it needs a new timing chain and sensor of some kind, two days, is what it is.

When I picked up he told me they see this all the time with the new D.I. Engines. Loose low friction rings allow more oil past to get burned up and sent our the exhaust, gets worse with miles. He also added I should check oil level every 800 miles or so which I have done. Sure enough its using oil, two quarts in 4500 miles, now how the heck is that better for the environment?

Sometimes it seems two steps forward and the steps back. On the other hand most of what he said could have been b.s. but there are many online stories of the same experience.

PC
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Old 04-19-2017, 06:00 PM   #2
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Direct injection has nothing to do with oil consumption. Diesels have been using direct injection since forever, they don't have oil consumption issues.

Some engines just consume oil. Most don't, but with tolerance stackups, its possible to get one that does. In fact, BMW even suggests that on some of their new vehicles, a quart every 600 miles is normal. Source

Nissan had to eat it on a lot of warranty dollars on VQ35DE motors (G35, 350Z) because of excessive oil consumption, and that wasn't a DI motor. . .

A class action was launched on Toyota for excessive oil consumption on their 2AZ-FE which is NOT a DI engine.

So to suggest that DI leads to excessive oil consumption is patently false.

Last edited by RandomTask; 04-19-2017 at 06:02 PM.
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Old 04-19-2017, 06:12 PM   #3
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Porsche says the same thing about 600 miles per quart can be normal, at least in new cars. The common cure for a new Porsche that is burning oil is to bang it off the rev limiter a few times to insure the rings are fully seated.
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Old 04-19-2017, 06:33 PM   #4
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My 13 equinox did the same thing at 70K Miles, my dealer replaced the pistons and rings under warnity NC!
maybe I need to add, my best friend owns the dealer.
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Old 04-19-2017, 07:03 PM   #5
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Not sold on these new cars being better on mileage. My 13 Buick Regal gets about 24 in mostly highway driving. Best I've seen is 26. My 92 Taurus SHO gets better and burns maybe 1/2 a quart in 3500 miles. That's with 130kmiles revving it to 8k and an occasional 100 shot of N2O.

The amount of complexity needed to squeeze out ever 1/10 of a mpg has past the law of diminishing returns. I miss having a throttle cable and a car actually doing what I ask before running my inputs through 38 CPUs.
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Old 04-19-2017, 07:12 PM   #6
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My DI LS1 hardly burns any oil......
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Old 04-19-2017, 07:15 PM   #7
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My SL400 has a direct injection, twin intercooled turbo V6 and has never burned a drop of oil.
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Old 04-19-2017, 07:22 PM   #8
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My new Toad, Chevy Colorado duramax, DI...34 mpg on the road. 28 mpg average. Don't burn any oil. But it won't get used but 3-4 thousand miles a year.
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Old 04-19-2017, 07:37 PM   #9
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The early LSs with the piston slap drank a lot of oil.

This has nothing to do with DI. However oil carboning up the intake valves is a problem because of DI. Auto makers are addressing it though through various means.
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Old 04-19-2017, 07:41 PM   #10
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Quote:
Originally Posted by Z06PSI View Post
The early LSs with the piston slap drank a lot of oil.

This has nothing to do with DI. However oil carboning up the intake valves is a problem because of DI. Auto makers are addressing it though through various means.
I said LS1 but I meant LT1...duh....

In any case, I run a catch can on mine and haven't had any issues (so far). Then again I've only got 38K on my C7

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Old 04-19-2017, 07:46 PM   #11
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Quote:
Originally Posted by KenHorse View Post
I said LS1 but I meant LT1...duh....

In any case, I run a catch can on mine and haven't had any issues (so far). Then again I've only got 38K on my C7
If you could just get rid of the taillights.
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Old 04-19-2017, 07:53 PM   #12
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D.I. allows for higher compression = more efficient. I have 3 D.I., C7 and a couple of F**d Foci, none use oil.
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Old 04-19-2017, 07:59 PM   #13
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For about six or seven years, many series of BMW's don't even have a dipstick. I don't think I've added a quart of oil to any of our family sedans in at least a decade. They were all higher end German cars.
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Old 04-19-2017, 08:00 PM   #14
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Quote:
Originally Posted by Z06PSI View Post
The early LSs with the piston slap drank a lot of oil.

This has nothing to do with DI. However oil carboning up the intake valves is a problem because of DI. Auto makers are addressing it though through various means.
Hyundai recommends using either Hyundai injector cleaner or Techron every 10,000 miles if you don't use a top tier fuel. They say if you fail even one tank, they will not warranty injectors or fuel system.

My service adviser told me to have them service the intake every 30,000 miles to insure no oil build-up on the intake valves.

I bought a 5.0 Mustang in 2010. One of the early ones out. At 2,000 miles it was 2 quarts low. I thought they didn't fill it from the factory, but then I was also pretty sure I checked it new and at around 1,000 miles. From that point forward it used a quart every 1000 miles. The dealer kept telling me it would stop when it got "broke in". I asked when that was and he said 15,000 miles. Well at 14,800 miles it was low a quart of oil and due for a change. I told the dealer it was still using oil at the exact 1 qt every 1000 miles. He said it will stop soon. Checked it at 16,000 miles and it was full. Didn't use a drop of oil after that. Was like a switch was flipped and at 15,000 miles it stopped.
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Old 04-19-2017, 08:04 PM   #15
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I broke in my 2015 Mustang in with a ProCharger (14psi) at 400 miles on the clock. Doesn't use a drop and currently at 12K miles.
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Old 04-19-2017, 08:39 PM   #16
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Thanks for all the replies. Service manager had his opinion I guess and shared it with me. I really can't remember having a car that I had to put oil in and I have had many. Company cars alone is like a new one every 2 and a half years or less, been 20 years plus. And all the cars I have bought for family and my wife, she also gets a company car every couple years, been 20 years.

Only recently have they been DI cars so sounded plausible to me, plus he should know. Well then again this is dealership service and we all hear stories about them. Another 4000k miles and it goes back and a new one will sit in my drive, so couple more quarts and that's that.

Cheers,

PC

Last edited by Darion; 04-19-2017 at 10:11 PM.
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Old 04-19-2017, 10:08 PM   #17
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Should I assume that with all the strict emission regulations and fancy emission equipment, an engine ought to be able to cleanly burn a quart of motor oil every 1000 miles?

I mean, that's not anywhere near what a 2-stroke weed-whacker burns. I can't imagine the EPA and CARB letting cars off the lot that are going to run "dirty" for the first 15k miles. Maybe the cats and computer controls and everything are enough to burn off a little bypassed oil.
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Old 04-19-2017, 10:52 PM   #18
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One of my employee's has a DI 4 cylinder Equinox and it drinks oil.
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Old 04-19-2017, 10:53 PM   #19
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Quote:
Originally Posted by Z06PSI View Post
If you could just get rid of the taillights.
Phphphptttttt!!!
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Old 04-19-2017, 11:31 PM   #20
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Quote:
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Phphphptttttt!!!
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