New Oil Change Interval for 2015s?

[Ubersuber]

Subaru makes cars in America:

http://www.subaru-siatest.com

Oil change intervals are currently in a state of flux and Japan is way behind.

Modern oils are good for two years and 20,000 miles.

DI does not dilute oil with fuel, not possible.

[sluflyer06]

Originally Posted by Ubersuber

Subaru makes cars in America:

http://www.subaru-siatest.com

Oil change intervals are currently in a state of flux and Japan is way behind.

Modern oils are good for two years and 20,000 miles.

DI does not dilute oil with fuel, not possible.

How does possibility of fuel dilution in DI differ vs. standard methods?

[bluesubie]

Originally Posted by Ubersuber

Subaru makes cars in America:

http://www.subaru-siatest.com

No one is denying this. Like Subaru of America, SIA is it's own entity but they do not write the owner's manual.

Originally Posted by Ubersuber

Oil change intervals are currently in a state of flux and Japan is way behind.

Modern oils are good for two years and 20,000 miles.

DI does not dilute oil with fuel, not possible.

C'mon! Please know what you are talking about before you make such bold claims. Did you even bother to use google?

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2780756

http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3366152/1

http://gf-6.com/sites/default/files/...g%20Hurdle.pdf

http://papers.sae.org/2013-01-2569/

-Dennis

[Ubersuber]

Originally Posted by sluflyer06

How does possibility of fuel dilution in DI differ vs. standard methods?

I would've thought fuel directly injected would be completely consumed. However, googling the topic suggests that perhaps DI isn't as clean burn as one would suppose. (and you're right I should have checked the interweb first). I see no cause for concern about this issue on the internet, from sources who might know about this. For example, the SAE article precis was restricted to a phenomenon arising from low rpm pre-ignition win turbocharged DI engines, not fuel contamination per se. Our engines are of course not turbo'd and are also a hybrid injection design.

The old carburetters needed hot spots downstream of the carb venturis to ensure fuel vaporization was complete. Raw fuel droplets frequently found their way into the combustion chambers and fuel burning was incomplete. Port injection under pressure atomized the fuel more thoroughly and the fuel was drawn right into the combustion chamber with little opportunity for droplets to adhere to the intake tracts.

DI has the added advantage of compressing and heating only the air after which the fuel is sprayed directly into the hot compressed air under very high delivery pressure. DI engines are cleaner than older designs for this reason, and much more powerful if the increase in detonation resistance is exploited by raising compression.

However, I see that there is some talk that combustion is still not 100% even with DI so some fuel may make its way from the cylinder walls into the oil. Got to be minimal though. Are people seriously getting significant fuel contamination of their Subaru sumps?

I'd be interested in reading technical papers from the DI manufacturers or engine manufacturers.

[strat61caster]

Just something worth noting when I was browsing NASIOC (checking out Impreza's as a practical car) there seems to be an ongoing oil consumption issue, many members seem to blame the ring design, since they're still on the FB block I'm thinking (hoping) that with Toyota's oversight and the high CR in the FA20 that we won't have this problem down the road, I haven't seen a rash of people reporting consumption and mine's been rock solid, maybe 1/4 Qt. 3/4 of the way through an interval.

227 page thread inbound:
http://forums.nasioc.com/forums/show....php?t=2357460

Possible solution:
http://forums.nasioc.com/forums/show....php?t=2640770

Am I wrong in thinking that oil consumption and fuel contaminating the oil go hand in hand?

[bluesubie]

The 86's do not show as high as percentage of fuel contamination, generally speaking, as the turbocharged FA20 engine in the new Foresters (check the long uoa thread in this forum). The Forester example that I linked shows 6% fuel in only 1,200 miles of driving. The Lubrizol pdf does discuss turbo and NA DI engines.

No, oil consumption and fuel contamination do not necessarily go hand in hand. You could have both, but not always. Ring design is blamed on that oil consumption problem because SoA has a TSB about it.

[xxBrun0xx]

Originally Posted by Ubersuber

Subaru makes cars in America:

http://www.subaru-siatest.com

Subaru builds Camry's... Interesting...

[Jfheisenberg]

Im about to set up an appointment with the dealer for the first oil change. I have a 2015 BRZ and it has about 1500 miles. If i go this upcoming Saturday i will be at around 1750 miles.

The dealers says the first oil change should be at 3500 miles, but that seems to high for the first oil change since it has the factory oil.

Im thinking on doing the first oil change regardless and then going back at the 3500 miles for whatever maintenance they do.

Any advise?

[Koa]

Originally Posted by Jfheisenberg

Im about to set up an appointment with the dealer for the first oil change. I have a 2015 BRZ and it has about 1500 miles. If i go this upcoming Saturday i will be at around 1750 miles.

The dealers says the first oil change should be at 3500 miles, but that seems to high for the first oil change since it has the factory oil.

Im thinking on doing the first oil change regardless and then going back at the 3500 miles for whatever maintenance they do.

Any advise?

3500 miles? That's pretty early for a dealer change. I thought 2015 brz was revised to 6k?

[Jfheisenberg]

Originally Posted by Koa

3500 miles? That's pretty early for a dealer change. I thought 2015 brz was revised to 6k?

Yeah he dealer guy told me 3500 miles first maintenance.

[Koa]

Originally Posted by Jfheisenberg

Yeah he dealer guy told me 3500 miles first maintenance.

Dealer guy is wrong, unless they are going to honor that one for free on top of the other 6k/15k intervals, etc.

Long gone is the need for one to change out the "break-in oil" early. These things are broken in from the factory and that includes an oil change from their first high moly factory break in fluid. I changed mine myself at 3k and the UOA showed it was absolutely unnecessary to do so. I am now going to stick to the recommended dealer interval change.

[Jfheisenberg]

Originally Posted by Koa

Dealer guy is wrong, unless they are going to honor that one for free on top of the other 6k/15k intervals, etc.

Long gone is the need for one to change out the "break-in oil" early. These things are broken in from the factory and that includes an oil change from their first high moly factory break in fluid. I changed mine myself at 3k and the UOA showed it was absolutely unnecessary to do so. I am now going to stick to the recommended dealer interval change.

I have a 100$ credit with the dealer to use for any maintenance and stuff like that. I just checked my oil and it looks clean. I just thought i change it since i drive it for about 60 miles everyday (mostly highway).

[bluesubie]

Originally Posted by Jfheisenberg

I have a 100$ credit with the dealer to use for any maintenance and stuff like that. I just checked my oil and it looks clean. I just thought i change it since i drive it for about 60 miles everyday (mostly highway).

The way motor oil looks doesn't tell you anything about the condition of the oil. And the factory fill is not drained at the factory and the car is indeed delivered to the dealer's lot with a sump of Idemitsu factory fill, which is higher in moly and ZDDP than the dealer fill.

[Jfheisenberg]

Originally Posted by bluesubie

The way motor oil looks doesn't tell you anything about the condition of the oil. And the factory fill is not drained at the factory and the car is indeed delivered to the dealer's lot with a sump of Idemitsu factory fill, which is higher in moly and ZDDP than the dealer fill.

Sorry, i lost it in your last sentence. So when is recommended to change the first oils change in a 2015 brz?