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oil differences? -- High Mileage vs. Synthetic

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    oil differences? -- High Mileage vs. Synthetic

    I picked up a case of oil today. I buy Cenex Auto Gold 10w-30. As I always do, I just grabbed the top box of 10w-30 off of the pile in the store. Got home and noticed that there is a difference from the case of oil I already have.

    Both are Cenex Auto Gold 10w-30. One is marked "For High Mileage Engines" and the one I bought today is marked as "Synthetic". I compared the wording on the bottles and there doesn't seem to be much of a difference. Only thing I really found was that the "High Mileage" oil helps to keep the seals in better shape. Does it really matter (engine wear-wise) if the one I picked up says "Synthetic"? I always use a bottle of Lucas Oil Treatment when I change oil, anyway. Just thought I'd see what you guys thought. Btw, there were no visual differences in the boxes or the bottles other than the fine print.

    #2
    You got a bargian, Synthetic oil usually costs a good deal more than regular oil.

    The synthetic should do a better job of burnoff resistance and viscosity retention. This is good for a old 302 as you see your oil pressure drop at idle quite a bit when the oil breaks down.
    2004 Marauder M79 90K miles Jmod!! 14.85 @95.63
    2004 Crown Vic LX 135K Silver Birch Light flint leather FMX1 04 P-71 PCM swap 04 P-71 Airbox and Zip tube "$100 MZT" 01 F-250 70 MM TB 21mm swaybar wood steering wheel BH headlight relay

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      #3
      Don't mix them, whatever you do. Forget that synthetic crap, unless you want leaks popping up.
      '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
      '95 Ford Bronco XL -

      sigpic :rebel:

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        #4
        Don't mix what? The two types of oil or the Synthetic and Lucas? Why shouldn't they be mixed? A little late for me to take the oil back.

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          #5
          The two types of oil.
          '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
          '95 Ford Bronco XL -

          sigpic :rebel:

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            #6
            Be careful with synthetic oils, It caused a rear main seal to start leaking badly on a friends 89 Taurus with 110k on it. It never leaked oil before he switched to it. I stick to regular oil since it really doesn't help a high mileage engine much and synthetic oil is about $4 a quart.
            Current rides - 1991 Ford Thunderbird 3.8 v6 (gas saver/DD) - New Heads/Headgaskets with ARP studs, Air Silencer Delete, 70mm MAF, Plasti-dipped Matte Black with a Silver Metalflake Overlay, Muffler Delete, some LED's, 30.233 MPG for high MPG average!
            2006 Jeep Wrangler 4WD (fun vehicle/backup DD) - 4.0/6spd - too many mods to list.

            Associated Panthers:
            Father's 1994 Ford Crown Victoria - Stock, 45,000 miles.
            Sold in 2007 - 1987 Mercury Grand Marquis LS "Grandpa Special" 2 door.
            http://www.cardomain.com/ride/2128327

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              #7
              personally, synthetic oil costs more to buy and shows you where you are gonna have to spend money. it leaks out easier than regular or high mileage. i only use valvoline 10-40w year round and every other oil change i use the high mileage. i use a thicker oil due to how far i have to drive to work and living in B.F.E. i took Vickie, my white 1987 CV, in for an oil change before and they mhad a synthetic blend. big mistake on my part. now she leaks and cant seem to get all of them fixed. first was the valve covers, than the sending unit, now the lower intake is leaking. my opinion stay away from synthetic or blends. like i stated, i use regular and every other time i use high mileage since it has the other additives.
              Addicted to 86-87 Panthers

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                #8
                You guys had me thinkin', so I ran down and spoke with my mechanic. They use nothing but Cenex oil. This stuff is a synthetic blend, not a full synthetic. It's in the '91 right now (which I need to change the oil on) and there are no issues. All should be well on my part. Yay for me.

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                  #9
                  I just change my oil every 3000Kms :canada: it comes out clean. I don't see a point in using synthetic unless you want to extend your change intervals.

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                    #10
                    Use the synthetic motor oil. I use it and no leaks!!!


                    '90 Mercury Grand Marquis GS
                    Baseline 5.0L numbers totally stock, 123 rwhp, 239 rwtq
                    5.4L swap coming soon.

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                      #11
                      If you use synthetic from the get-go, you will REALLY benefit.
                      1983 Grand Marquis 2Dr Sedan "Mercules"
                      Tremec TKO conversion, hydraulic clutch, HURST equipped!

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                        #12
                        I'm using synthetic in a newly rebuilt Flathead V8 (8BA). I used the dino stuff to break it in. It was hard to start with that stuff. It also got dirty really fast. Changed it again at 500 miles, got dirty and hard to start. Switched to synthetic, starts easy and stays clean. I'm sold on it.
                        1990 Country Squire - weekend cruiser, next project
                        1988 Crown Vic LTD Wagon - waiting in the wings

                        GMN Box Panther History
                        Box Panther Horsepower and Torque Ratings
                        Box Panther Production Numbers

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                          #13
                          I ran synthetic in the VW for heat resistance reasons. Air cooled motors cook oil in a bad way. 300 miles and it would be black with conventional oil. Blends were good to about 1000 and full synthetic let me do the reccomended 2500 mi oil changes with brown oil instead of something that looked like roofing tar. I ran the first 15k or so in the Lincoln with regular oil, and I've got synthetic in it now. The truck has 140k and always had dino oil. Doesn't leak a drop and at this point I'm scared of changing to synthetic.
                          86 Lincoln Town Car (Galactica).
                          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                          91 Lincoln Mark VII LSC grandpa spec white and cranberry

                          1984 Lincoln Continental TurboDiesel - rolls coal

                          Originally posted by phayzer5
                          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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