These oils are probably difficult to get stateside but as this seems to be the place to log technical data, thought it worth giving details of them. Search them out as they are one of the better high performance oils here in UK.
Silkolene PRO S 5w-40
KV 100DegC 14.89
KV 40DDegC 92.35
VI Index 169
Pour -51 DegC
Flash 210 DegC
HTHS 4.07
Noack 6%
Silkolene PRO S 10w-50
KV 100DegC 18.17
KV 40DDegC 116.49
VI Index 174
Pour -33 DegC
Flash 210 DegC
HTHS 5.11
Noack 5%
Silkolene PRO R 15w-50
KV 100DegC 18.2
KV 40DDegC 130
VI Index 156
Pour -35 DegC
Flash 200 DegC
HTHS 5.23
Noack 5%
They seem to compare with Redline and Amsoil and are PAO/Ester.
I asked the Silkolene Chemist why they favour the use of esters and Diesters in particular and here was his reply:
Quote:
In actual blends, the esters should not have to ‘fend for themselves’ when it comes to oxidation resistance at high temperatures; they are protected by efficient antioxidants.
With the right antioxidants scavenging free radicals and protecting ‘beta hydrogen’, there is little to choose between equivalent diesters and polyol esters in automotive applications.
In fact, diesters can have higher polarity, and higher VI than an equivalent polyol. High VI means that the ester contributes to the ‘multigrade effect’, so a smaller quantity of VI improver is needed. Remember, even the best VI improvers are shear prone to some extent, so replacing a proportion with totally shear-stable ester is a Good Thing.
Cheers
Simon
Silkolene PRO S 5w-40
KV 100DegC 14.89
KV 40DDegC 92.35
VI Index 169
Pour -51 DegC
Flash 210 DegC
HTHS 4.07
Noack 6%
Silkolene PRO S 10w-50
KV 100DegC 18.17
KV 40DDegC 116.49
VI Index 174
Pour -33 DegC
Flash 210 DegC
HTHS 5.11
Noack 5%
Silkolene PRO R 15w-50
KV 100DegC 18.2
KV 40DDegC 130
VI Index 156
Pour -35 DegC
Flash 200 DegC
HTHS 5.23
Noack 5%
They seem to compare with Redline and Amsoil and are PAO/Ester.
I asked the Silkolene Chemist why they favour the use of esters and Diesters in particular and here was his reply:
Quote:
In actual blends, the esters should not have to ‘fend for themselves’ when it comes to oxidation resistance at high temperatures; they are protected by efficient antioxidants.
With the right antioxidants scavenging free radicals and protecting ‘beta hydrogen’, there is little to choose between equivalent diesters and polyol esters in automotive applications.
In fact, diesters can have higher polarity, and higher VI than an equivalent polyol. High VI means that the ester contributes to the ‘multigrade effect’, so a smaller quantity of VI improver is needed. Remember, even the best VI improvers are shear prone to some extent, so replacing a proportion with totally shear-stable ester is a Good Thing.
Cheers
Simon
