Royal Purple 2-Cycle Oil Mathematics

Discussion in 'Lawn Mowing Equipment' started by Merkava_4, Mar 15, 2019.

  1. Merkava_4

    Merkava_4 LawnSite Bronze Member
    Messages: 1,464

    http://www.royalpurple.com/product/hp-2-c-2-cycle-motor-oil/

    The STIHL synthetic oil that I've been using is about $25 for a 6-gallon mix which is a six pack of 2.6 ounce bottles; and that don't even include the gasoline! At the auto parts store, they have single quart size bottles of Royal Purple 2-cycle oil for $12.99.

    Now if 1 quart = 32 ounces; and I divide that by 2.6 -- that gives me 12.3076 or 12 gallons of gasoline mixed at 50:1 out of one single quart. Is that right ? ? ? Because if that's right, that's 1/2 the price of STIHL HP Ultra full synthetic.
     
    Last edited: Mar 15, 2019
  2. Scottdubya83

    Scottdubya83 LawnSite Senior Member
    Male, from Central, LA
    Messages: 330

    You sure the Stihl bottles your buying are 2.6oz? That seems really high. I used to use the Stihl HP. I bought 6 packs of the 6.5oz bottles (2.5 ga mix) for about that price ($25).

    But yes, your basic math is correct...
     
  3. Merkava_4

    Merkava_4 LawnSite Bronze Member
    Messages: 1,464

    $25 is the lowest price I found on on eBay.

    The current local price is $17.40 for the 2.6 ounce six pack.
     
  4. DXN1EL

    DXN1EL LawnSite Silver Member
    from TEXAS
    Messages: 2,158

    I just buy the quart bottle of Lucas 2 cycle, about $9 dump it in the tank and pump 12.3 gall of gas.
     
    Doc8406 likes this.
  5. Merkava_4

    Merkava_4 LawnSite Bronze Member
    Messages: 1,464

    So you round it off to 12.3 instead of 12 ?

    Interesting; that's what I should do.
     
  6. Scottdubya83

    Scottdubya83 LawnSite Senior Member
    Male, from Central, LA
    Messages: 330

    A while back I switched to amsoil saber @ 80:1
    I can’t find it locally (atleast not competitively priced) so I order from amsoil. Pay a membership fee once a year and get free shipping and 25% discount on their prices.
    At first I bought 8oz bottles to mix in 5ga can. Now, I buy by gallon. I saved those 8oz bottles which I refill. Ends up costing around $2.50 per 5 gallons (or $.50/ga). Equipment runs great in saber @ 80:1
     
  7. Graverunner68

    Graverunner68 LawnSite Member
    Messages: 96

    I buy quarts when I can. I'm not picky on the brand. I have tried a lot of brands. The synthetic ones are less ashy. I think as long as mixed 50 to 1 or close they all work. Right now I'm using pennzoil.
     
    ARN Greencare likes this.
  8. Merkava_4

    Merkava_4 LawnSite Bronze Member
    Messages: 1,464

    Called the local store again. $26.94 for the 6.4 ounce six pack. STIHL HP Ultra.
     
  9. Merkava_4

    Merkava_4 LawnSite Bronze Member
    Messages: 1,464

    So 80:1 comes out to 8 ounces for 5 gallons of gasoline?
     
  10. Scottdubya83

    Scottdubya83 LawnSite Senior Member
    Male, from Central, LA
    Messages: 330

    Yes... 128x5= 640 /80=8
     

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