"High Mileage" Oil??? [Archive] - GrandAmGT.com Forum

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Rba007
03-13-2004, 09:16 PM
Ive ran Mobil One 5-30 Synthetic since I purchased the car with 30,000 miles on it two years ago. Now im up to 101,000 , and wondering if i should consider switching to one of the many synthetic oils formulated for higher miles. My engine does seem to have a good bit of "chatter" at idle, and I do go through a bit of oil over the 3,000 mile change period. Any thoughts on switching oil??

-Dave

Mike Jung
03-14-2004, 12:09 AM
No, I wouldn't go with a 'high-mileage' oil (that have like gasket swelling properties in the oil).

If you want to get rid of the engine chatter:
Use a thicker oil (in the summer) like Mobil 1 Truck & SUV 5W40 motor oil (or maybe Mobil 1 10W30 , or made in Germany-Castrol Syntec 0W30).
This Mobil 1 Truck & SUV 5W40 motor oil will also help with the oil burning-off (as it has a low burn-off rate); as it is re-labelled Mobil Delvac 1 diesel synthetic motor oil in smaller quart bottles.

2002AmSE
03-14-2004, 08:13 AM
Umm, I think i'd be getting more info on what your doing before you follow with that ^^^. He just said 10W30, and 0W30 in the same suggestion, those are vastly different, and I don't see why you would say 0W30 when you are suggesting a thicker oil... A little chatter at a cold idle is perfectly normal, and I wouldn't be so sure that changing oil grades will change anything.

Rba007
03-14-2004, 08:29 AM
Its not just cold idle, its idle no matter the temp.

tenspeed
03-14-2004, 08:30 AM
It looks like a typo to me, I think Mike missed the 1 when he was typing 10W30. His statement makes more sense that way.

I wouldn't change to "high mileage" oil either unless I was using a lot of oil between changes, like a quart per thousand miles. Even then, I'd be more inclined to use a 10W40 or 20W50 to slow down oil burning and leaking.

Rba007
03-14-2004, 08:49 AM
Alrighty Guys, So i should use what im using but up it to 1030 or something? Im going through about a quart per 3000.

tenspeed
03-14-2004, 09:09 AM
Try the 10W30 and see what happens. It looks like you're changing oil every five weeks anyway.

02PONtiac!
03-14-2004, 10:25 AM
put the product called "Engine Restorer" in there at your next oil change. This should quiet things up a bit.

Mike Jung
03-14-2004, 12:17 PM
Originally posted by Mike Jung
...or made in Germany-Castrol Syntec 0W30...
Originally posted by 2002AmSE
Umm, I think i'd be getting more info on what your doing before you follow with that ^^^. He just said 10W30, and 0W30 in the same suggestion, those are vastly different, and I don't see why you would say 0W30 when you are suggesting a thicker oil...
I was thinking of the hot temp ratings.

The (made in Germany) Castrol Syntec 0W30 is actually closer to a 40 weight oil when hot with a cSt @ 100 C of 12.2 (vs Mobil 1 5W30 & 10W30 with a cSt @ 100 C of 10.0 but the Mobil 1 10W30 is more shear stable than the 5W30)
30 weight = a cSt @ 100 C of 9.5 to 12.5.
40 weight = a cSt @ 100 C of 12.5 to 16.3.
(Yeah, when extreme cold German Castrol Syntec 0W30 is a thinner oil than 5 or 10 weight.)


:wow: the Mobil 1 Truck & SUV 5W40 / Mobil Delvac 1 has a cSt @ 100C of 14.8 (even at 40C it is pretty thick for a 5W rated oil, thicker than the Mobil 1 10W30 at 40C).

2002AmSE
03-14-2004, 04:20 PM
So when the engine is cold it will still be really thin, would 5w30 german castrol syntec have same or higher properties @100C

Mike Jung
03-15-2004, 12:17 AM
Originally posted by 2002AmSE
So when the engine is cold it will still be really thin, would 5w30 german castrol syntec have same or higher properties @100C
There is available in North America:
Made in Germany - Castrol Syntec 0W30
Made in Belgium - Castrol Syntec 5W40
(the rest) Made in USA - Castrol Syntec

So no made in Germany Castrol Syntec 5W30 is available here.

The made in USA Castrol Syntec are not real 'synthetic' (uses a hydrocracked Group III basestock, no PAO-Group IV basestock) motor oils.

Made in USA Castrol Syntec 5W30 motor oil has a cSt @ 100 C of 9.7.


But you could buy BMW High Performance Synthetic Oil 5W30 (which is made in Germany Castrol TXT Softec Plus 5W30).
It has a cSt @ 100 C of 11.9.
This is the factory fill oil for BMW (non M-series) to North America market.


Using a 0Wx motor oil is not always too thin.
Made in Germany Castrol Syntec 0W30 (which is made in Germany Castrol Formula SLX 0W30) is also the factory fill oil for BMW (non M-series) for European market.

Porsche uses Mobil 1 0W40 motor oil with a cSt @ 100 C of 14.3.
The Mobil 1 0w40 is actually thicker at 40C than Mobil 1 10W30.
So it depends on the properties of the motor oil.

Rba007
03-15-2004, 09:55 PM
So pretty much, I should stick with what ive got but give 10w30 a shot first correct? Sorry, all the numbers make me pass out.

Mike Jung
03-16-2004, 09:39 AM
Originally posted by Rba007
So pretty much, I should stick with what ive got but give 10w30 a shot first correct? Sorry, all the numbers make me pass out.
Yes, I'd recommending trying a thicker oil (only in the summer or when it is above 0C).
You can try Mobil 1 10W30 to get a little less oil loss because it is more shear stable (than 5W30); which would result in a little less oil burn-off.
But I don't think the Mobil 1 10W30 oil will help with the engine 'clatter' noise when the engine is hot.
As the Mobil 1 5W30 & 10W30 are about the same thickness when hot.
& the Mobil 1 5W30 & 10W30 are on the 'thin' side of the 30-weight oil rating.

If you can find it (is released / being released, depending on your location), try: Mobil 1 Truck & SUV 5W40 oil.
I read some owner's of Corvettes & GM pick-up trucks getting engine clatter in the summer using Mobil 1 5W30 & 10W30.
They started using a heaver grade of oil & the engine clatter noise disappeared.
One GM pick-up owner was using Mobil 1 15W50 in his 5300 Vortec engine when towing in the summer (because he found that with Mobil 1 10W30, his engine would clatter).
He is going try this summer the Mobil 1 Truck & SUV 5W40 (relabelled Mobil Delvac 1 5W40) oil.
He loves the Mobil Delvac 1 in his HD diesel trucks & machinery.