Hi,

I do not believe there is any way 0W-30 and 0W-40 have same longevity.

One of the reasons why synthetic oil has to be eventually changed is
metal particles held in suspension. These particles are by-products
of wear.

0W-30 and 0W-40 differ in wear in two cases. One case has been
mentioned by you several times. 0W-40 provides better wear protection
for bearings. So, given identical driving conditions, 0W-30 will have
to hold in suspension more metal particles resulting from inferior
protection of bearings.

Second, 0W-30 flows better during cold starts. So, amount of metal
particles which need to be held in suspension due to metal to metal
contact while oil is in sump is greater for 0W-40 which does not flow
as well when cold.

So ... for long trips where the effects of metal to metal contact
during cold starts is minimal, 0W-40 should have better longevity,
and for short trips where the effects of metal to metal contact during
cold starts is more pronounced, the advantage of 0W-40 should be largely
neutralized.

So, in many ways a "Time For Service" indicator tuned for 0W-40 is
NOT appropriate for regular oil changes with 0W-30. Therefore, either
9-3SS owners have to be told to change their own oil with 0W-40,
buy 0W-40 and insist dealer use 0W-40 instead of store brand for oil
changes, OR they should be told to not trust "Time For Service"
indicator.

You cannot say 0W-40 protects bearings better and say 0W-40 and
0W-30 have identical longevity when one of the factors affecting longevity
is amount of metal particles which have to be held in suspension.

thanks

Jae

posted by 68.49.4...

• Final word on oils, Bill S , Fri, 20 Dec 2002 13:34:40
  • Hey, I wished I'd posted this ---hahahaha, TG, Mon, 23 Dec 2002 17:24:41
  • Pragmatic answer from my dealer, Mike D, Mon, 23 Dec 2002 02:13:02
  • Re: Final word on oils, Bob T in Ct, Sun, 22 Dec 2002 02:24:38
  • No such thing as "final word on oils" on this BB n/m, DivrDon , Sat, 21 Dec 2002 17:09:50
  • Re: Amsoil to the rescue!!!, Mike, Sat, 21 Dec 2002 15:53:25
  • One word: PENNZOIL..., b.flippo, Fri, 20 Dec 2002 18:32:11
    • but Arnold Palmer swears by Quaker State n/m, Aero'ed, Sat, 21 Dec 2002 09:54:04
    • Finally, why spend more if don't have to? LOL n/m, Anders, Fri, 20 Dec 2002 18:52:32
  • them's fightin words! n/m, johnw, Fri, 20 Dec 2002 17:58:37
  • This assumes..., lowbar, Fri, 20 Dec 2002 17:06:09
    • Uh oh ... It seems I've caused ..., J, Fri, 20 Dec 2002 17:38:13
      • There once was a man with a shrink, Greg Netzner, Fri, 20 Dec 2002 19:23:03
      • Apolgy, Bill S , Fri, 20 Dec 2002 17:58:37
        • No worries ..., J, Fri, 20 Dec 2002 18:06:40
  • Do you think there is enough difference ..., J, Fri, 20 Dec 2002 16:23:11
    • 9-3SS is not all aluminum construction ---, Ian Glenday , Fri, 20 Dec 2002 18:56:44
    • all-aluminum construction means LESS friction and wear?, Aero'ed, Fri, 20 Dec 2002 17:46:00
      • Alright ... in my previous post, I misspoke ..., J, Fri, 20 Dec 2002 18:00:27
        • NINES Explains..., Stephen Goldberger, Fri, 20 Dec 2002 19:03:27
          • Re: NINES Explains..., Jason 0W-40, Sat, 21 Dec 2002 02:02:20
            • Dude ... do you EVER sleep?!? :-) n/m, J, Sat, 21 Dec 2002 02:05:19
              • will change my name to "Jason Insomniac" shortly-LOL-nm, Jason 0W-40, Sat, 21 Dec 2002 02:14:24
          • Is "Time for Service" indicator tuned for 0W-40 or ..., J, Fri, 20 Dec 2002 22:05:32
            • That's not the problem..., Stephen Goldberger, Sat, 21 Dec 2002 00:01:08
              • We're not letting you off that easily ..., J, Sun, 22 Dec 2002 15:51:00 <-- Viewing This Message
                • Let's SEE just WHAT SAAB SAYS on this point, TG, Mon, 23 Dec 2002 17:39:56
                  • Thank you TG, although ..., J, Mon, 23 Dec 2002 22:29:15
                • Oil Monitor Parameters, Greg Netzner, Sun, 22 Dec 2002 19:54:51
                  • Thanks Greg ..., J, Sun, 22 Dec 2002 23:02:03
                    • More for J & Stephen, Greg Netzner, Mon, 23 Dec 2002 12:05:39
                      • I'll try to wrap this up and put a bow on it., J, Mon, 23 Dec 2002 15:26:05
                        • The oil monitor spec is GM LL- A-025 for gas engines, TG, Mon, 23 Dec 2002 17:28:49
              • But I thought..., Greg Netzner, Sat, 21 Dec 2002 10:52:07
                • The Only Difference..., Stephen Goldberger, Sat, 21 Dec 2002 13:38:35
            • Man! You're just BEGGIN' for a fight!, Greg Netzner, Fri, 20 Dec 2002 23:28:00
  • Re: Final word on oils, Jason 0W-40, Fri, 20 Dec 2002 16:15:48
    • look @ mobil1.com I did, breeze, Fri, 20 Dec 2002 16:47:15
      • When I did it, it came up with wrong info, TG, Mon, 23 Dec 2002 17:23:06
      • You're talking to Mr. 0W-40! Mobil1.com specifies ..., J, Fri, 20 Dec 2002 17:00:34
  • I doubt it..., bRAD, Fri, 20 Dec 2002 14:08:55
    • Oh no, this will never be over, phred, Fri, 20 Dec 2002 14:17:27
      • Then again, if you have a C900..., Noel, Fri, 20 Dec 2002 15:09:41
        • Re: Then again, if you have a C900..., TG, Mon, 23 Dec 2002 17:30:48
        • That used to be the accepted wisdom, phred, Fri, 20 Dec 2002 16:44:08

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