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  1. #1
    Join Date
    Apr 2005
    Posts
    454
    hey i have a 99 z71 seirra 5.3 and i run mobil1 5w30 oil and b&m trickshift synthetic trans fluid i was wonderin what fluids u guys use and what antifreeze i should use since im gonna flush it out
    1999 GMC Sierra black reg cab short bed SLE Z71 5.3 <--CARDOMAIN PICS
    NELSON 93 hot tune, 02 PCM, VOLANT Ram air intake, MSD wires, ACdelco iridium plugs , Edelbrock ceramic shorty headers, jegs off-road y pipe, Dynamax int pipe, 3" Magnaflow Exhaust with turndown, EGR removal, throttle body bypass, vette servo, long servo pin, performance 4th apply piston, B&M shift kit, SLP 160* thermostat, LS1 Fans, NELSON harness, ported and polished throttle body (did it myself, for free lol)..... _______? cam is next as soon as i stop spending all my money

  2. #2
    Join Date
    Jan 2005
    Location
    Conway, AR
    Posts
    1,353
    I use M1 in the tranny, crankcase, and diffs. For the coolant I just use the good ole green Prestone. When I was installing my 160* hypertech powerstat I noticed sludge coming out of the drain hole and the thermo housing. Not so good if you ask me, so I did the switch and has been running just as good as ever. BTW, the oil I am using is Mobil1 Extended Use Synthetic 5w-30 for 15k with a 7.5k filter change with Mobil1 filter.

    Chris
    2009 Silverado, HPTuners, all stock.

  3. #3
    Join Date
    Jun 2003
    Posts
    713
    i run reg dex in the tranny. reg 80w 90 in the diff. i run royal purple in the engine. and i run the green stuff for coolant.
    04 supercrew 5.4 3 valve-magnaflow catback



    formerly 02denali 12.79@107

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