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#1
10-08-2013, 11:15 PM
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Castrol Syntec or Mobil1
My rig's PO used Syntec 5w50 religiously so I stuck with it. O'Relly's hasn't had a sale on Syntec for a while, it's now at around $9 a qt. They do, however, have Mobil1 15w50 on sale til the end of Oct. for $6 a qt, well, all the Mobil1 varieties on sale. Hard to imagine I could go wrong. Thoughts?
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1986 300SDL, 362K 1984 300D, 138K Last edited by cmac2012; 10-09-2013 at 02:55 PM. 
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#3
10-08-2013, 11:25 PM
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I'd go with the Mobil1, and I think you can get it for a small bit less at Wal
 Mart.
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco...  " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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#4
10-08-2013, 11:29 PM
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It's worth a look but in my previous looksees, Walmart doesn't have a wide choice of weights on any brand they carry. Same with Costco - just 2 or 3 basic sizes. I dunno if I'm obsessive to go with 50 weight or not.
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1986 300SDL, 362K 1984 300D, 138K
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#5
10-08-2013, 11:43 PM
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Sure cmac... just when things are getting testy in OD, you have to start an oil thread... Sadist.
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On some nights I still believe that a car with the fuel gauge on empty can run about fifty more miles if you have the right music very loud on the radio. - HST 1983 300SD - 305000 1984 Toyota Landcruiser - 190000 1994 GMC Jimmy - 203000  https://media.giphy.com/media/X3nnss8PAj5aU/giphy.gif
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#7
10-09-2013, 06:28 AM
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Quote:
New brand?? I wonder if its as good as MOBIL 1 ?
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#8
10-09-2013, 06:47 AM
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Quote:
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#9
10-09-2013, 12:59 PM
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What I understood was that most synthetic oil sold in the US cannot legally be sold as synthetic in other countries? Or at least in Europe and Japan?
Even so, if that is so, is it an engineering/lubrication thing or a legal/marketing thing?
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#10
10-09-2013, 01:08 PM
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Have you looked at the analysis in Bob Is The Oil Guy?
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow
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#11
10-09-2013, 01:24 PM
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Which rig?
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-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic.
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#12
10-09-2013, 02:01 PM
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Another thing you can do is to do what I did for my truck. 3000 mile oil change but I am using synthetic and stretching it to 5000 (I have 2 HPOPs which supposedly is hard on the oil and causes shearing of the molecules). How I arrived at this number? Take a used oil sample and they will tell you how "worn out" it is. Blackstone Laboratories is a good one. They will tell you how wore out it is and how far you can stretch the interval.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow
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#13
10-09-2013, 02:57 PM
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Quote:
Wise guy. 
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1986 300SDL, 362K 1984 300D, 138K
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#14
10-09-2013, 03:00 PM
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Quote:
FWIW, I'm finding more votes for Mobil1 on the web than for Syntec. And word is you can add dino oil to synthetics if you have nothing else available w/o ill effects. Certainly compared to the ill effects you'd get for not having enough oil. So if that's the case, hard to imagine that topping off with Mobil1 will be a problem tween now and next oil change.
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1986 300SDL, 362K 1984 300D, 138K
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#15
10-09-2013, 03:05 PM
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Quote:
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1986 300SDL, 362K 1984 300D, 138K
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