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Supercharged engine oil #5255271 10/31/19 04:50 PM
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Superbenz Offline OP
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Hi everybody!
I'm writing from Italy, I'm a happy owner of a 1990 Mercedes W124 Coupé 300 24 supercharged with a Rotrex C30/94 that gives 350 hp at the crank.
Now I'm rebuilding the engine with Woessner forged pistons and other works needed.
On these cars it's recommended to use 10w40 oil but now I suppose I need something else.
My idea is to try with a 5w50 or 10w60 but I'm very undecided about this, there are too many options in the world of lubricant...
I greatly appreciate any advice!

Re: Supercharged engine oil [Re: Superbenz] #5255301 10/31/19 05:29 PM
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bdcardinal Online Content
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How readily available is Liquimoly 5W50? Maybe that or Castrol 10W60.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Supercharged engine oil [Re: Superbenz] #5255361 10/31/19 06:51 PM
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tundraotto Online Content
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Go with what the engine builder recommends...would be my choice.

Re: Supercharged engine oil [Re: Superbenz] #5255395 10/31/19 07:41 PM
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ZeeOSix Offline
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Originally Posted by Superbenz
On these cars it's recommended to use 10w40 oil but now I suppose I need something else.


10W-40 should be good ... thicker than anything used in engines with 350 HP in the USA. Why would you think you need thicker oil than 10W-40?

Re: Supercharged engine oil [Re: ZeeOSix] #5255560 11/01/19 01:05 AM
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Superbenz Offline OP
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Thank You for the answers,
Originally the engine was normally aspirated with 220hp,
I've installed last year a supercharger increasing considerably the power.
I think 10w40 is no longer sufficient for the new working conditions as higher temperature, more mechanical stress etc.

Re: Supercharged engine oil [Re: Superbenz] #5255629 11/01/19 05:24 AM
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Linctex Offline
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Originally Posted by Superbenz

I think 10w40 is no longer sufficient for the new working conditions as higher temperature, more mechanical stress etc.


No, it will be fine.

I ran Shell Rotella 15W-40 in my 700 HP twin-turbo Ford 351W (5.8 L) engine.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Supercharged engine oil [Re: Linctex] #5256152 11/01/19 05:06 PM
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Superbenz Offline OP
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OK, I will use Motul 300v 10w40 chrono, it seems to be one of the best oil available here in EU.
Thank you all!

Re: Supercharged engine oil [Re: Superbenz] #5256436 11/02/19 05:06 AM
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Superflan Offline
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It this a race car?


‘01 Peugeot Partner 1.9 D, 5W40 A3/B4, 266000 Km, running on WVO
Wife's '19 Suzuki Vitara 1.0 Boosterjet (TGDI), 5W40 A3/B4, 10000 Km
Backup's ‘01 Toyota RAV4 3-dr 2.0 VVTi, 5W40 A3/B4, 160000 Km
Re: Supercharged engine oil [Re: Superflan] #5256542 11/02/19 07:58 AM
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Superbenz Offline OP
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No, no it's a street car.

Re: Supercharged engine oil [Re: Superbenz] #5256545 11/02/19 08:01 AM
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Superbenz Offline OP
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[quote=Superbenz]No, no, it's a street car.
But I would to use a very good quality oil and the correct viscosity after all the money I'm spending for rebuild the engine...

Re: Supercharged engine oil [Re: Superbenz] #5259727 11/06/19 07:34 AM
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Superflan Offline
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IIRC, 300V line oils aren't meant to be used in street cars, because can't stand the OCIs or something but I might be wrong.

Look on here there's a few 300V used oil analysis


‘01 Peugeot Partner 1.9 D, 5W40 A3/B4, 266000 Km, running on WVO
Wife's '19 Suzuki Vitara 1.0 Boosterjet (TGDI), 5W40 A3/B4, 10000 Km
Backup's ‘01 Toyota RAV4 3-dr 2.0 VVTi, 5W40 A3/B4, 160000 Km
Re: Supercharged engine oil [Re: Superbenz] #5262479 11/09/19 11:05 AM
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Superbenz Offline OP
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Yes, You're right! Thank You

What oil would you feel to advise me ?
I'm a little confused...

Re: Supercharged engine oil [Re: Superbenz] #5262659 11/09/19 04:15 PM
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Mitch Alsup Offline
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The thing more important than the oil grade selected is an oil temperature gauge so you can see when the oil you have chose is getting thin.
This will do 2 things:
a) you won't want to run the engine hard until the oil is up to temperature (over 160ºF)
b) you won't want to run the engine hard when the oil is over temperature (over 275ºF)

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