There's a fuss going on in the oil world right now. The EPA is pushing 120K-mile catalyst warranties. Even trace amounts of various extreme-pressure additives usually found in oils can poison the catalyst if they get into the exhaust. So the new SAE SM oil spec mandates a reduction in these additives - good for catalysts but bad for anything that slides.

Some manufacturers are rebelling and refusing to approve use of SM-rated oils in their cars. IMO anything SM-rated is to be avoided. And if you care about oil life past 5000mi or so you want to look for the ACEA A3/B3 ratings and/or BMW LL01.

The SL-rated Mobil1 0W-40 used to be good stuff. Mobil claims the SM-rated 0W-40 still meets LL01, but lots of folks are scratching their heads wondering how. Note that Mobil1 oils run thin, so you have to go to a 40-weight to get similar viscosity to anyone else's good 30-weight.

The new Mobil 1 Extended Performance line is what the old SL-rated Mobil 1 was.

Now, another choice for you. The Shell Rotella T Synthetic 5W-40 is a good Group III oil (some would call it a pseudo-synthetic, but it's good stuff) sold primarily as a diesel oil but it's SL-rated for gasoline-engine use, it's got a healthy dose of EP additive for cam lobe life, I use it in various cars.



posted by 198.144.20...

• Switching from dino 10W30 to M1 at 125k - too late?, hanesj75, Sun, 13 Nov 2005 17:00:27
  • Well, I'm running Mobil 1 0W40, hanesj75, Thu, 17 Nov 2005 10:03:52
  • Two Mobil 1s...and an alternative, JEM, Tue, 15 Nov 2005 18:48:13 <-- Viewing This Message
  • A biased reply, Dick in Falls Church, Tue, 15 Nov 2005 18:23:24
  • Re: Switching from dino 10W30 to M1 at 125k - too late?, TML , Tue, 15 Nov 2005 00:08:56
    • Have you ever poured a 15-40 syn at 0 F???, Bill U, Tue, 15 Nov 2005 09:19:59
      • That is wrong..., dag, Tue, 15 Nov 2005 11:02:06
  • Proceed without fear, AK Colin, Mon, 14 Nov 2005 17:33:23
  • Re: Switching from dino 10W30 to M1 at 125k - too late?, Bill U, Mon, 14 Nov 2005 11:04:00
  • My rant about oil (long and tedious), Abusot, Mon, 14 Nov 2005 07:59:33
  • No worries, mate. Go ahead and switch., Noel, Sun, 13 Nov 2005 17:37:09
    • Re: No worries, mate. Go ahead and switch., bmn, Sun, 13 Nov 2005 19:39:47

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