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Zinc in oil

Discussion in 'The Bench' started by Dan K, May 19, 2008.

  1. Dan K

    Dan K Well-Known Member

    I am sure this has been discussed here, as it was in the last GSXtra, but the Alfa board has had some interesting discussions, many of the respondants claiming no wear in their high revving engines on non-zinc oil. Anyway, Castrol is selling Syntec 20w50 with high zinc content and adviertising it as being for older vehicles(see the link). Is 20w-50 a good weight for our engines? Thanks, Dan
    http://www.castrol.com/castrol/genericarticle.do?categoryId=82915470&contentId=7032644
     
    Dan K, May 19, 2008
    #1
  2. 73-462GS

    73-462GS GS Mike

    In my opinion it is not! Use the ZDDP additive and use over the counter 10W30 or straight 20 or 30. I live in Michigan where it gets cold so anything 50 weight is to viscous. Mike D.
     
    73-462GS, May 19, 2008
    #2
  3. bobc455

    bobc455 Well-Known Member

    20W50 is okay for a Chevy motor, but the Buick motors tend to like thinner oil (10W30 or so). If your engine was rebuilt by a Chevy shop, and has wide clearances, 20W50 will keep the oil pressure up.

    Good to know that at least one oil company is addressing the zinc issue, even if in the wrong viscosity for us.

    I suspect most Alphas have roller cams, but I'm not positive.

    -BC
     
    bobc455, May 19, 2008
    #3
  4. copperheadgs1

    copperheadgs1 copperheadgs1

    20-50 goes KNOCK_KnOCK when you start it up. Not good in my book
     
    copperheadgs1, May 19, 2008
    #4
  5. yacster

    yacster Lv the gun tk the Canolis

    15-40 Rotella works the best for me. I add MOA (BG products). I like the results. Got rid of a nasty lifter tick I was having too.:TU:
     
    yacster, May 19, 2008
    #5
  6. DaWildcat

    DaWildcat Platinum Level Contributor

    A good rule of thumb is to run the thinnest oil that gives you 11-12 psi per 1000 rpm. If you're making serious power then a thicker range might be more appropriate, other wise it's a band-aid for something else that's not right.

    Just my $0.02. There are as many opinions on oil as there are brands & viscosities.

    Devon
     
    DaWildcat, May 20, 2008
    #6
  7. DUTCH WILDCAT

    DUTCH WILDCAT 64 wildcat

    valvoline vr1 << link

    has also oil listed with zddp in 10w30????
     
    DUTCH WILDCAT, May 20, 2008
    #7
  8. Bad Buick

    Bad Buick Foe Fiddy Five

    I used to use 20-50 in my 455 and I'll never do it again as I had to rebuild it:dollar: a couple years after I started using it. I've used nothing but straight 30w or 10-30 since then and after 9 years it still runs fine with good oil pressure.:beer
     
    Bad Buick, May 21, 2008
    #8
  9. Scot69GS400conv

    Scot69GS400conv Stepchild

    Mike Phillips suggested I use the 20W - 50 in my motor. I use the Brad Penn - Penn 1 green racing oil and so far so good. I only have a few thousand miles on it though. I live in South FL where it's always hot ...... if that makes a difference.
     
    Scot69GS400conv, May 21, 2008
    #9

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