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  1. J

    should i switch to a synthetic blend?

    KieferS wrote: "I don't want to use a fully synthetic oil, because i don't think it's worth the money for my application, and i don't want to risk a leak." is this true about full synthetics (leak)? welcome to BITOG by the way.
  2. J

    Pick one: opinion

    i've emailed Valvoline 2 days ago & got a reply: their full synthetic SynPower & synthetic mix DuraBlend are beefed up with seal swell/seal conditioners, though not as much as MaxLife. i would use either Valvoline or Mobil 7500. Mobil 7500 is also API CD. what does CD mean?
  3. J

    Pick one: opinion

    1)Castrol Syntec Blend 10W-30 = GF-4/CF not mentioned (not CF certified?) 2)Mobil Clean 7500 10W-30 = GF-4/CF 3)Valvoline Synthetic Blend (DuraBlend) 10W-30 = GF-4/CF taken from their respective website. thank you TooSlick about API CF info. valvoline was highly recommended to me by 77GrandPrix...
  4. J

    2006 jeep grand cherokee using Mobil1 5W-30

    thank you very much for all the input, folks. -SyN-, i'll pm or keep you posted
  5. J

    Mobil1 T&SUV Availability?

    are you looking for Mobil1 T&SUV 5W-40? check out nearby AutoZone, Kragen, Checkers retailers. it's always in stock there.
  6. J

    2006 jeep grand cherokee using Mobil1 5W-30

    thanks a lot, RiotGrip & Triple_Se7en! i should switch back to 5W-20.
  7. J

    2006 jeep grand cherokee using Mobil1 5W-30

    thank you, Paul. maybe i should switch back to 5W-20 but will continue to use Mobil1 instead of conventional oil.
  8. J

    2006 jeep grand cherokee using Mobil1 5W-30

    i've checked out other SUVs & the oil viscosity they're using, & almost all are using 5W-30. these are 2005 & 2006. so i was wondering why would Chrysler recommend a much thinner oil? anyway, if something happens to the engine it's warranted for 70,000 miles/7 years
  9. J

    2006 jeep grand cherokee using Mobil1 5W-30

    thank you, patrick. yes, the JGC has a cylinder deactivation or MDS (multi-displacement system) 4 out of the 8 cylinders turn off when cruising on the freeway to save gas, thus the use of a thinner oil (5W-20) is called for. in my opinion, 5W-20 is just too thin. i would rather pay more for gas...
  10. J

    2006 jeep grand cherokee using Mobil1 5W-30

    greetings, folks. my 2006 jeep grand cherokee 4x4 5.L hemi V8 requires 5W-20 conventional oil, but i don't trust this thin oil viscosity so i'm using Mobil1 5W-30. i think the requirement to use 5W-20 has to do with the C.A.F.E. mandate. by using 5W-30, would this hurt the engine? hope to get a...
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