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Old 06-01-2005, 10:24 AM   #1
Bill Murray
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1997 SC1
1997 SC1
Default Oil experiment update, 97 SC!

background
97SC1 100,000+ miles
oil consumption had increased slowly over time to approx 1000 mi/qt on 5W30.
no external leaks at all
driven by college kid, lots of short trips, occasional "road trips"
(I top up back to full mark when oil level gets to halfway point on the crosshatch)

Mobil 1 0W40 used approx 1 qt in 3500 miles

Castrol 0W30 (German "green" formula) approx .7 qt in 4200 miles
(gas mileage check for last 2 tankfulls = 37mpg)

just switched to Shell Rotella T 5W40 @ 116,000 miles

(your results may vary........side effects may include headache, nausea, temporary back or shoulder pain, and drowsiness.....not studied for multiple attempts per dose....... )

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Old 06-01-2005, 02:13 PM   #2
kev-inc
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Default Re: Oil experiment update, 97 SC!

It's interesting that your car is consuming less GC than M1...maybe the M1 cleaned some crud out of the ring pack. You should try going back to M1 and check the consumption...

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Old 06-01-2005, 02:39 PM   #3
96GSL1
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Default Re: Oil experiment update, 97 SC!

I wouldn't doubt if it was GC that did the cleaning.

Remember that 0w-30 Castrol is reallly close to a 40w, too.

...
96 SL1 202k
98 Windstar 123k

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Old 06-01-2005, 09:11 PM   #4
Bill Murray
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1997 SC1
1997 SC1
Default Re: Oil experiment update, 97 SC!

I think one/both of the oils cleaned things out, the dipstick has been completely cleansed of any discoloration.

After the Rotella comes Mobil 7500 5W30, then Mobil 1 Truck & SUV 5W40

(the German Castrol is hard to find, and apparently has been reformulated from Green to Gold color, but will get another try later on)

With 2 oil changes/year this will take a while.

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Old 06-01-2005, 09:48 PM   #5
mjo
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1995 SL2
Default Re: Oil experiment update, 97 SC!

I used to burn a quart every 2-3k miles. Putting a bypass filter on my car did the trick. All I have to do now is change the TP element and add a half quart every 3k miles and replace the Purolator spin-on filter every 12k miles. 13k miles and so far it ceased burning oil in the slightest and every day the engine is quieter like I just did an oil change. I'm using mobil 1 5w30 right now.

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Old 06-02-2005, 01:31 AM   #6
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Default Re: Oil experiment update, 97 SC!

Interesting experiment Bill. It seems the what I have read at BITOG is the Saturn engine does better with the thicker oil or a 40 weight oil from members that have post UOA's there. I know German Castrol is on the thick side, and stable. So, my guess that helped consumption. I know my consumption increased with Mobil 1 5w-30, which I have heard is on the thin side of 30 weight oil. Based on your earlier post, I bought a bunch of Mobil 1 0w-40 Euro Spec oil that was $2.00 a quart on clearance at Auto Zone, that I will mix with the 5w-30 Mobil 1 next year when my car goes off warranty. I will patiently await your next test results, and see if there are any side effects.

MJO, you have some impressive results with your bypass setup. It is nice that it is working out for you!

...
Truth alone triumphs, not untruth.

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Old 06-17-2005, 09:23 AM   #7
Bill Murray
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Default Re: Oil experiment update, 97 SC!

update: first 1000 miles on Rotella 5W40 no apparent consumption
last 2 tank average 34 mpg (AC on all the time)

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Old 06-17-2005, 11:01 AM   #8
shuck
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Default Re: Oil experiment update, 97 SC!

I am really interested in the 5W-40 results. That will allow me to purchase one oil for my entire vehicle fleet (other vehicle is a 95 chevy pickup with 6.5L turbo diesel). I have heard of a lot of guys using the 5W-40 Rotella in all sorts of gas engines.

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Old 07-03-2005, 05:57 PM   #9
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Default Re: Oil experiment update, 97 SC!

I've used Rotella 5w-40 in my 96SL2. There's a small MPG penalty given that it doesn't have any viscosity index improvers, but it's definitely a great oil!

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Old 07-03-2005, 09:11 PM   #10
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Default Re: Oil experiment update, 97 SC!

HomeBase - did you mean no friction modifiers? There is no way an ordinary dino oil would be rated at 5W-40 without the VI improvers. It would stay closer to monograde.

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Old 07-03-2005, 11:53 PM   #11
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Default Re: Oil experiment update, 97 SC!

Oops, you're right, I did mean FM's, not VII's....

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Old 07-25-2005, 07:34 AM   #12
Bill Murray
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Default Re: Oil experiment update, 97 SC!

update:
3000 miles on Shell Rotella 5W40
oil consumption approx one half pint so far

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Old 07-25-2005, 10:24 AM   #13
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Default Re: Oil experiment update, 97 SC!

I switched to Mobil Clean 5000 5W30 on my last oil change in my 95 SL2 that was burning 1/2 qt per 300 miles. So far, I have only added a 1/2 qt at 1000 miles and the oil level is staying steady. I also changed my PCV valve to the OEM one just prior to the oil change but I didn't notice any immediate improvement. A few oil changes previous to that, I ran a pint of MMO in the crankcase and did a Sea Foam soak on the pistons and rings that didn't show any improvement either.

I going through the same process now on my 97 SC2 that is burning 1 qt per 100 miles. I just changed to the Mobil Clean 5000 5W30 and should know fairly quickly if there is any change.

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Old 09-02-2005, 05:05 PM   #14
Bill Murray
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Default Re: Oil experiment update, 97 SC!

4000 miles on Rotella, somewhat less than a pint total consumption.
Was working on some ABS problems so went ahead and changed oil too.
This run is Mobil 1 5W30 non EP (found it in the barn, forgot I even had it)

this is oil change #26 @ 120,000 miles

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Old 09-02-2005, 10:35 PM   #15
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Default Re: Oil experiment update, 97 SC!

When I used Dino 10W40 on my SL2 I was using 1 quart every 1500 miles. I have been using Mobil 1 5W30 for the past 20,000 miles and have been using NO oil at all between changes (3,000 mile intervals) and I have found my gas mileage increased a great deal!

+1 for synthetic in S-series.

...
2008 Honda Civic LX Atomic Blue
1992 SL2 Two Tone Medium Red/Silver

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Old 09-03-2005, 12:31 AM   #16
FrozenPilot
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Default Re: Oil experiment update, 97 SC!

Glad I'm not the only one with good results using Rotella T synthetic.

...
Its all about the coffee...

'06 Mazda 6i & '95 Saturn SL1

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Old 09-03-2005, 11:07 AM   #17
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Default Re: Oil experiment update, 97 SC!

Quote:
Originally Posted by Bill Murray
background... lots of short trips, occasional "road trips"...
Can you describe your driving habits for us?
  • Do you drive on the conservative side or aggressive side?
  • How much downshifting occurs when you pass vehicles?
  • Slow, smooth starts, or jack-rabbit starts?
  • Mostly freeway driving at steady speeds?
  • Do you stay at or below the speed limits?
Based on your stated MPG, it sounds like you are fairly conservative with the gas pedal. Anyway, just curious about it...

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Old 09-05-2005, 12:49 PM   #18
Bill Murray
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Default Re: Oil experiment update, 97 SC!

My daughter drives it pretty much exclusively (Dad only gets it when there's a "problem" LOL)
She is a very careful driver.
I would be pretty sure she is among the top 10-20% of drivers in gas mileage habits.
Over the summer the car was getting mostly suburban driving, minimal stop and go, little interstate.
Now back @ school it will get lot of 2-4 mile trips, with some occasional freeway trips.

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Old 10-14-2005, 09:25 PM   #19
Bill Murray
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Default Re: Oil experiment update, 97 SC!

Update:

2000 miles on Mobil 1 (non EP) 5W30
approx 1 pint consumption
per BITOG Mobil 1 is toward the thin side of the viscosity range
I'm guessing that's why it has more consumption than the Castrol or Rotella

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Old 01-07-2006, 03:31 PM   #20
Bill Murray
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Default Re: Oil experiment update, 97 SC!

4000 miles on current Mobil 1 5W30
total consumption approx 1 quart
recent fuel economy 33 mpg (good for winter / short trips )

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