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Thread: Add Motor Oil to Fuel, or?

  1. #1
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    Question Add Motor Oil to Fuel, or?

    Had a sticking injector someone pointed to the new fuels as the reason then suggested 2 quarts of motor oil to a tank to unstick the injector and keep using motor oil as a fuel lube. Injector has been fine and I have been adding motor oil to fuel since situation.

    Been using name brand cetane boosters and fuel lubes/cleaners and wonder now If ashless 2 stroke or just plain ole motor oil is better as fuel lube?
    99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.

  2. #2
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    I won't take a side on the "oil in fuel" argument, but if you are going to add oil, use 2 cycle oil. It's formulated to burn in the combustion chamber. Motor oil has additives that are not designed for this purpose. A lot of folks use it this way, but the long term effects are unclear. I've used motor oil for corrective/diagnostic reasons, but wouldn't use it on a regular basis.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3

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    At what ratio would you recommend for un-sticking a hanging injector? I'll use 2-cycle...1 quart per 50 gallons? 30? 10?
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K

  4. #4
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    Default Ratio? Serious thought needed

    I used 2 qts 30wt for 43 gals; Everyone in these parts are stating ashless 2 stroke oil is best way to go but stumped as to at what ratio?

    I'm concerned as I was using well known brand name diesel fuel additive products when injector stuck.
    99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.

  5. #5
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    Quote Originally Posted by DA BIG ONE View Post
    I used 2 qts 30wt for 43 gals; Everyone in these parts are stating ashless 2 stroke oil is best way to go but stumped as to at what ratio?

    I'm concerned as I was using well known brand name diesel fuel additive products when injector stuck.

    It's more likely the "stuck" injector needed the viscosity improvement more than lubrication. Sounds like it's wearing/worn out, or you got a sloppy reman. The same thing works for tired IP's.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  6. #6
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    Default

    After playing with ratios using 2-stroke, about 1/2oz per gallon seems to be working good for me. Anything less, and I don't see any benefit, and I didn't see any difference between 1/2 oz and 1 oz.
    1987 Jeep Grand Wagoneer...new 6.5 in process...diamond block, 18:1's, other goodies...


  7. #7
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    Default Viscosity

    Quote Originally Posted by DmaxMaverick View Post
    It's more likely the "stuck" injector needed the viscosity improvement more than lubrication. Sounds like it's wearing/worn out, or you got a sloppy reman. The same thing works for tired IP's.
    They were reman and some had different numbers was told they were all modified to hi-pop specs. Judging from your well informed and expert input on viscosity I'm looking at getting new injectors soon..............................
    99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.

  8. #8
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    Be careful when looking at the "hi-pops". There's 2 ways to make them. One (the correct way) is to use marine hard parts and the proper spring. The second (unreliable) is to just shim the spring to compress it more for a higher pop pressure. The second method more often results in a set of inconsistent injectors that don't last nearly as long. The spring is forced beyond its design, and gets weak quickly. There's also issues with internal bore alignment which can result in a "stuck" injector. If you want high performance injectors, stick with true high pops or new marine injectors.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  9. #9
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    Question Marine Injector Hard Part Numbers?

    What number should I look for when getting hi-pop marine injectors and where can I get them?
    99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.

  10. #10
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    Start with TDP Advertisers. You'll get what's advertised. If not, let us know. I don't know the numbers, but those vary anyway.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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