The 2013 Subie owners book says use 87 octane fuel in both the 4 and 6. Why is there a question about this?

Asked by May 14, 2016 at 05:51 PM about the 2013 Subaru Legacy 3.6R

Question type: General

1 Answer

13,475

Are you asking what to use? There is no question 87 is fine for those 4 cylinder and 6 cylinder Natural aspirated engines, they do have high static compression ratios, so high octane fuel is of NO benefit. Now an STI turbo does benefit from higher octane as the turbo really just boosts the cylinder filling and DOES increase the dynamic compression ratio. If your into power read about thermodynamics and increased compression ratios. Kinda easy to understand just a time investment to learn.

Best Answer Mark helpful

Your Answer

Subaru Legacy Experts

  • #1
    Anthony_60
    Reputation
    1,270
  • #2
    Nick Eidemiller
    Reputation
    740
  • #3
    dandyoun
    Reputation
    730
View All

Related Models For Sale

Used Subaru Impreza
201 Great Deals out of 22,704 listings starting at $1,505
Used Subaru Outback
428 Great Deals out of 36,733 listings starting at $1,000
Used Subaru Forester
410 Great Deals out of 38,639 listings starting at $1,000
Used Subaru Impreza WRX
40 Great Deals out of 1,173 listings starting at $1,500
Used Honda Accord
1,129 Great Deals out of 73,674 listings starting at $1,100
Used Toyota Camry
1,078 Great Deals out of 86,843 listings starting at $800
Used Honda Civic
817 Great Deals out of 60,960 listings starting at $950
Used Subaru Impreza WRX STI
26 Great Deals out of 620 listings starting at $9,490
Used Ford Fusion
1,025 Great Deals out of 63,216 listings starting at $888
Used Nissan Altima
1,338 Great Deals out of 77,841 listings starting at $1,695
Used BMW 3 Series
1,159 Great Deals out of 32,872 listings starting at $1,200
Used Audi A4
328 Great Deals out of 12,508 listings starting at $1,899
Used Toyota RAV4
836 Great Deals out of 53,246 listings starting at $1,600

Used Cars For Sale

2018 Subaru Legacy For Sale
8,436 listings starting at $19,672
2017 Subaru Legacy For Sale
29 Great Deals out of 1,477 listings starting at $15,000
2016 Subaru Legacy For Sale
18 Great Deals out of 635 listings starting at $11,495
2015 Subaru Legacy For Sale
75 Great Deals out of 1,567 listings starting at $10,950
2014 Subaru Legacy For Sale
22 Great Deals out of 571 listings starting at $6,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.