Correct oil for an high powered GT four

[oilmansi]

Wolf,

I'm pretty sure that either Motul, Fuchs or Silkolene would be available in Italy.

If you can source them then look for a proper synthetic like Motul 300V 5w-40, 10w-40 or Silkolene PRO S 5w-40 or 10w-50 or Fuchs Titan Supersyn SL 5w-40.

HTHS

SAE has a test called HT/HS (High Temperature/High Shear ASTM D4683 @ 150 degC)

The results from this test are very helpful in indicating the quality of the oil.

The higher the HT/HS number the better because this indicates less shearing.

Petroleum oils tend to have lower HT/HS numbers because they are made with light weight basestocks to begin with and have a tendency to burn off easily at high temperatures.

This causes deposit formation and oil consumption. As a result of excessive oil burning and susceptibility to shearing (as well as other factors) petroleum oils need to be changed more often than synthetics.

Synthetic basestocks do not thin out so much as temperatures increase.

Synthetics generally have higher HT/HS numbers.

The higher number basically means that the oil remains "in grade" for a much longer period of time for better engine protection and longer oil life.

Cheers
Simon

 

[Arup]

Speaking of HTHS, group II oils like DELO 400 and Delvac Super hold up pretty well in that department. Mobil-I too is another product which would be suitable for a high revving 4, my Acura Integra GSR survived for 140,000 miles before I sold it and from the beginning it was on a M-1 15W-50 diet.

 

[deviant]

redline is available @ www.sportcompactonly.com

 

[Wolf_Tm250]

quote:

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Originally posted by Primus:
Agip is not Selenia, though both are Italian they are not made by FIAT. FL Selenia was a part FIAT group in the past, but it has nothing to do with the cars' quality from FIAT group.

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Ah ok, Primus, so I could use it in my chainsaw !

Bye bye !

 

[Wolf_Tm250]

Thank you Guys for the HTHS explanation !

I think I found the right oil for my car, thank you !

Bye