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Which engine oil is recommended


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Any opinions about Schaeffer Oil Supreme 7000? I've been running the 05W-30 for a while in my LGT and oil level has been staying pretty constant in between changes.

 

Never heard of it, however if you aren't consuming it, you are likely ok. A UOA will confirm it though.

 

-Mike Paisan

 

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I have a question. Which causes less consumption, a lighter weight like 0w20 or heavier like 10w30?

 

It depends on the motor, ambient temps, driving style, etc.

 

-Mike Paisan

 

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I have a question. Which causes less consumption, a lighter weight like 0w20 or heavier like 10w30?

I guess you ask this simply out of curiousity since 0W-20 shouldn't be used in your LGT.

 

There is no simple answer.

 

Many people have less consumption by moving up to a thicker grade (from 5W-30 to 5W-40). Others have less consumption by moving from thicker to thinner. I would probably compare 10W-30 to 5W-20 instead of 0W-20. Generally speaking, a 5W-20 and 10W-30 will have the least viscosity modifiers and they are the first thing in oil to break down. Does that mean less consumption? Possibly, possibly not.

 

Another thing to look at is NOACK volatility which measures the evaporation of oil.

 

http://www.pqiamerica.com/noack.htm

 

The volatility of most ILSAC GF-5 oils actually fall in the upper range of the allowable limit of 15%. http://www.gf-5.com/the_story/performance/

For off the shelf parts store oils, Pennzoil actually claims a very low NOACK somewhere down in the single digits, IIRC. Red Line and some Amsoil oils also have a very low NOACK. It's actually hard to find NOACK listings of some companies since a lower NOACK usually means a better base stock and better oil. They don't want you judging them based on their NOACK figures. Does choosing a low NOACK guarantee less consumption? Possibly, possibly not.

 

I don't even think you should compare an xW-20 to an xW-30 since many xW-30's will shear to a 20 weight anyway. When I asked a tribologist/oil blender about 10W-30 vs. 10W-40 in regards to consumption he advised that "the 10W-40 would be less volatile because one of the base oils in the mix would be a more viscous base oil".

 

Another thing to look at is High Temp High Shear. A higher HTHS is beneficial in maintaining viscosity over an oil change interval and combatting against oil loss. That's why European cars do now allow girly man Resource Conserving oils. Regardless of if you're looking at VW specs, Mercedes specs, Porsche specs, etc., they all must have an HTHS of 3.5 or higher.

 

So there is no one answer. You need to experiment with a variety of oils, base stocks, grades, additive levels, HTHS, etc. Even though I do not run thin GF5 Resource Conserving oils, they are actually showing very good uoa results with little or no consumption in some of the latest model Subaru turbos (2011 and 2012 WRX's). Whether or not this works for your application is another story.

 

Hope this helps. :icon_mrgr

 

-Dennis

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And if you want the best of both worlds, try a 0W-40. Usually thinner than a 5W-40 in freezing temps so it will pump more quickly. Pennzoil Ultra 5W-30 would be lighter than Mobil1 0W-40 in freezing temps, but I would rather have a thicker oil when the engine is at operating temp.

 

-Dennis

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mmm....unless there is something strange about Ultra...the 0W would be lighter than the 5W when freezing.

That the thing about oil. The first number on the bottle does not necessarily mean that the oil is thinner at freezing temps.

 

The first number comes from the apparent viscosity when tested at -30C for a 5W and -35C for a 0W.

http://www.pqiamerica.com/coldcrank.htm

 

You can use this viscosity graph to see the actual viscosity at a given temperature. http://www.widman.biz/English/Calculators/Graph.html

And enter the 40 and 100C numbers from the manufacturers product data sheet.

 

Pennzoil Ultra

Mobil1 0W-40.

 

That's why the numbers on the bottle do not tell you the whole picture.

 

-Dennis

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Hope everyone had a good thanksgiving! This is a lot of help from hearing with different oils but it just matters on the car if it reacts good or not but I'm running on penzoil and ima switch to cast roll gtx sync ima try that one out I was recommended with that. Also I've heard some Subaru owners use royal purple, does anyone have experience with royal purple is it really that good from what I hear?
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Hope everyone had a good thanksgiving! This is a lot of help from hearing with different oils but it just matters on the car if it reacts good or not but I'm running on penzoil and ima switch to cast roll gtx sync ima try that one out I was recommended with that. Also I've heard some Subaru owners use royal purple, does anyone have experience with royal purple is it really that good from what I hear?

 

"ima switch to cast roll gtx sync" is a huge grammar fail. :lol: Unless English is a second language.

 

Oil viscosity is more important than brand and if you run xW-30 you don't want it to say Energy or Resource Conserving.

 

For Castrol, use Castrol Edge with Syntec Power Technology in 0W-30 (aka German Castrol) or 5W-40.

 

For Royal Purple, use any weight of the High Performance Street oil or the 0W-40 or 5W-40.

 

-Dennis

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  • 2 weeks later...
i have a 2005 lgt wagon 5 speed with 140k miles on it. i live in central wisconsin where it does get cold out in the winter but not too cold. my car is stage 2 and i was wondering would it be ok to run shell rotella t6 5w-40 in my car? will that b ok with my climate? thanks
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i have a 2005 lgt wagon 5 speed with 140k miles on it. i live in central wisconsin where it does get cold out in the winter but not too cold. my car is stage 2 and i was wondering would it be ok to run shell rotella t6 5w-40 in my car? will that b ok with my climate? thanks

 

I would suggest a 5w30 oil for the wintertime. Motul or Amsoil both offer 5w30 weight oils that would be as good or better than the Rotella.

 

-Mike Paisan

 

http://www.pbase.com/paisan/image/91072632.jpg http://www.pbase.com/paisan/image/145749898/original.jpg http://www.pbase.com/paisan/image/133406601.jpg http://www.whiteline.com.au/images/logos/perf1.jpg

11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.

Call directly as We carry almost every manufacturer now, so before you buy parts call us.

Like us on Facebook! | E-mail: sales@azpinstalls.com | 725 Fairfield Ave | Kenilworth, NJ 07033 | 908.248.AZP1 (2971) | T-1 Certified Amsoil Direct Jobber |AIM: AZP Installs

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i have a 2005 lgt wagon 5 speed with 140k miles on it. i live in central wisconsin where it does get cold out in the winter but not too cold. my car is stage 2 and i was wondering would it be ok to run shell rotella t6 5w-40 in my car? will that b ok with my climate? thanks

In WI, I would go with German Castrol 0W-30 (Edge SPT) or Mobil1 0W-40. GC is thinner than M1 0W-40 down to about 68F/20C at which point the M1 becomes thinner. At operating temp. M1 is slightly thicker and has more anti-wear additives.

 

-Dennis

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