DOUBLE VS, SINGLE OVERHEAD CAM-

17,925

Asked by Jul 25, 2015 at 11:36 PM about the 2013 Subaru Outback 2.5i Limited

Question type: General

In 2013,  the Subaru Outback changed engines to a double overhead cam and timing
chain but only gained 3 horsepower.  Unfortunately,  there's percentage of cars that burn
excessive oil with the newer 0-20 weight.   Is this really more efficient or just more
complex.

4 Answers

56,435

The zero weight oil has to do with the government mileage test which starts with a cold engine. The zero weight helps the mileage for the first few seconds but after that does nothing. Most owners could not tell the difference in mileage without sophisticated test equipment under controlled conditions. It is my understanding that the problem is two fold, these engines use low tension oil rings to reduce friction and thin oil. You can use a heaver oil such as 5-20 or 5-30 synthetic on newer cars and there should be no warranty issues but you can double check with your dealer on that. I suspect using heavier oil will help but not stop the oil consumption issue.

Best Answer
17,925

Great job explaining this, the EJ 25 series engine used from 1989 to 2012 in two phases on the Subaru Outback was designed for 5-30 oil. In 2013 , the Outback got the new FB series engine with the synthetic 0-20 viscosity and all of these issues came to light..

44,445

0w20 and 5w20 oil is the same viscosity when the engine is warm. The second number (after the "w") is the oil's grade or viscosity. One is NOT "heavier" than the other. Using any oil other than what is recommended can cause engine damage in some unusually cold temperature events (pretty rare, but happens). This has to do with tight tolerances of the valve train and lack of lubrication at start up. I have actually seen camshafts seized in overhead cam engines some years ago due to wrong oil being used during -20F temperatures. These engines had 10w40 oil in them versus the recommended 5w30. For a good read on oil go to http://www.bobistheoilguy.com/putting- the-simple-back-into-viscosity/

44,445

http://www.torquenews.com/1084/subaru-gets-blanked-2015-jd-power- vehicle-dependability-study

Your Answer

Add photo

Related Questions

  • DO YOU THINK SUBARU OUTBACKS DEPRECIATE MORE SLOWLY THAN OTHER MODELS? 4 answers

    From what I've seen online, these wagons hold their value, so, it makes sense to keep them running a long time and fix repairs which seems like the least expensive thing to do vs. replace the v...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • Why do you think Subaru is number 1 in brand loyalty?? 1 answer

    Maybe it's because they are really good cars and offer value? What a concept?? All of you Subaru "haters" need not reply to this message. We know who you are.. http://www3.forbes.com/lifesty... ...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • ANALOG GAUGES - How accurate are they really? 13 answers

    In talking with some people I'm getting the impression from them that the analog gauge is really an optical illusion and not any more accurate than the warning lights on your dashboard? They say ...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • WHAT BROUGHT YOU TO SUBARU? 21 answers

    How did you discover the sweet sounds and performance of "flat engines "? Do you think they have a performance sweet spot, with the equal torque and horsepower specs?

    2010 Subaru Outback 2.5i Limited

    -

    General

  • can i swap a double overhead cam for a single 1998 2.5 2 answers

    heard it was a straight swap

    Subaru Outback

    -

    Maintenance & Repair

Outback

Looking for a Used Outback in your area?

CarGurus has 34,798 nationwide Outback listings starting at $1,620.

ZIP:

Search Subaru Outback Questions

Subaru Outback Experts

#1 Markw1952
Markw1952
Reputation 6,230
#2 TheSubaruGuruBoston
TheSubaruGuruBoston
Reputation 1,850
#3 F_O_R
F_O_R
Reputation 1,440
View All

Related Models For Sale

Used Subaru Forester
299 Great Deals out of 26,425 listings starting at $1,995
Used Subaru Impreza
203 Great Deals out of 16,061 listings starting at $1,995
Used Subaru Legacy
217 Great Deals out of 16,435 listings starting at $1,995
Used Honda CR-V
761 Great Deals out of 58,788 listings starting at $900
Used Toyota RAV4
583 Great Deals out of 69,402 listings starting at $2,350
Used Toyota Highlander
321 Great Deals out of 25,536 listings starting at $2,900
Used Toyota 4Runner
251 Great Deals out of 20,498 listings starting at $1,995
Used Subaru XV Crosstrek
74 Great Deals out of 2,308 listings starting at $9,980
Used Toyota Tacoma
484 Great Deals out of 39,056 listings starting at $2,900
Used Honda Accord
702 Great Deals out of 87,163 listings starting at $699
Used Jeep Grand Cherokee
1,006 Great Deals out of 73,078 listings starting at $950
Used Honda Pilot
318 Great Deals out of 20,891 listings starting at $2,199
Used Subaru Impreza WRX
36 Great Deals out of 1,161 listings starting at $1,450
Used Toyota Camry
787 Great Deals out of 89,574 listings starting at $950

Used Cars For Sale

2017 Subaru Outback 2.5i Limited For Sale
12 Great Deals out of 10,180 listings starting at $28,153
2016 Subaru Outback 2.5i Limited For Sale
15 Great Deals out of 359 listings starting at $24,400
2015 Subaru Outback 2.5i Limited For Sale
25 Great Deals out of 492 listings starting at $15,988
2014 Subaru Outback 2.5i Limited For Sale
18 Great Deals out of 487 listings starting at $11,995
2013 Subaru Outback 2.5i Limited For Sale
15 Great Deals out of 332 listings starting at $9,999