Once you use the semi-synthetic oil, you should stay with it. It has different cleaning properties, and a retro-fit of pure oil can have negative consequences. Same is true if you upgrade from the factory installed semi-syn to full synthetic - stay with the full if you make the move. I carry a couple of Saab Semi-Syn liters in the little compartment in the left rear of my Aero Wagon (the cd changer space) to have in case I need oil.

My independant Saab mechanic does not like synthetic oils in road cars at all. He says it is great in racing engines (lots of stress, high heat, short mileage between tear-downs, etc.) but he sees very unusual wear patterns on synthetically lubricated engines that have high mileage (130k+ miles) and he doesn't like what he's seen.

I'm staying with the semi-syn for now, and at least through the first 35k. By then a retrofit to Castrol will be out of the question.

• 9-5 posting- synthetic vs conventional oil, GaryG, Tue, 26 Jun 2001 14:41:22 <-- Viewing This Message
  • Re: 9-5 posting- synthetic vs conventional oil, Dick in Falls Church, Thu, 28 Jun 2001 17:34:27
    • Re: syn oil manufacturers don't do anything special w/ additives, Sjer, Sat, 30 Jun 2001 13:10:37
  • No, no and no..... (long), VIKINGMAN, Tue, 26 Jun 2001 16:03:42
  • Would 2 bottle Mobil 1 synth + 2 bottle fossil oil qualify as a, Hatch_92T23AT, Tue, 26 Jun 2001 15:24:33
    • No! never mix conventional oils w/synthetics, JMC, Tue, 26 Jun 2001 15:45:48
      • I am using 50% synth 50% fossil and engine has never been happier, Daren, Tue, 26 Jun 2001 23:17:20
      • Saab uses..., VIKINGMAN, Tue, 26 Jun 2001 16:06:17
        • Saab Turbo Oil is 5W30 semi-synthetic and apparently only for 9-X, ls, Tue, 26 Jun 2001 17:01:16
          • There's turbo oil and then there's turbo oil..., VIKINGMAN, Wed, 27 Jun 2001 09:23:50
          • Saab dealers used it in all 3 of my 9000s, BillJ, Tue, 26 Jun 2001 18:39:10
  • Unusual wear patterns? Can he/you elaborate on this? Thanks n/m, Aaron Gilbert, Tue, 26 Jun 2001 15:15:20

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