What oil do you use
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Joined: Jan 2008
Posts: 7,804
Likes: 2,232
From: Sammamish, WA
We use Shell Rotella T-Syntec 5w-40 in all our vehicles ('06 C6 Z51, '01 C5 Z06, '07 Kawasaki ZX-6R, '07 Kawasaki ZZR-600, '06 Suzuki SV650). Since it is essentially a diesel oil also approved for cars, it has much higher shear protection than Mobil1 and similar, and therefore it deterioriates much slower.
I had awful experience with Royal Purple on my previous car ('05 STi). My upgraded turbo was running pretty hot (Garrett GT30R), and it completely destroyed Royal Purple. It was more liquid than even water when I drained it!
I had awful experience with Royal Purple on my previous car ('05 STi). My upgraded turbo was running pretty hot (Garrett GT30R), and it completely destroyed Royal Purple. It was more liquid than even water when I drained it!
Safety Car
Joined: Aug 2004
Posts: 4,067
Likes: 62
From: Houston Texas
A very good oil, but there is an American alternative:
Used Oil Analysis Comparison: German Castrol 0w30 vs AMSOIL Series 2000 0w30
Of note, the AMSOIL Series 2000 0w30 was recently replaced with the AMSOIL Signature Series Synthetic 0w30
On the 15w50 vs xw30 discusion, I personally wouldn't use a 15w50 in a daily driven car, particularly in winter. The LSx engines are designed to operate with an oil with viscosity in the range of 10-12 cST, which is what most 30 grade oils are at a normal operating temp of 100C (212F). For comparison, Mobil 1 5w30's viscosity at 40C (100F) is 64.8, about six times higher than it is at 212F. And that's at a relatively warm 100F. It is much less viscous as it gets colder. Compare those numbers to that of Mobil 1 15w50, which is 18.1 cSt at 212F and 131.2 at 100F, over double that of the 5w30. If I did run 15w50, I'd be very very careful with the throttle until the oil was at least 150F.
I do run 10w40 on the track, but that is only after warming up the oil for about 15 minutes.
Used Oil Analysis Comparison: German Castrol 0w30 vs AMSOIL Series 2000 0w30
Of note, the AMSOIL Series 2000 0w30 was recently replaced with the AMSOIL Signature Series Synthetic 0w30
On the 15w50 vs xw30 discusion, I personally wouldn't use a 15w50 in a daily driven car, particularly in winter. The LSx engines are designed to operate with an oil with viscosity in the range of 10-12 cST, which is what most 30 grade oils are at a normal operating temp of 100C (212F). For comparison, Mobil 1 5w30's viscosity at 40C (100F) is 64.8, about six times higher than it is at 212F. And that's at a relatively warm 100F. It is much less viscous as it gets colder. Compare those numbers to that of Mobil 1 15w50, which is 18.1 cSt at 212F and 131.2 at 100F, over double that of the 5w30. If I did run 15w50, I'd be very very careful with the throttle until the oil was at least 150F.
I do run 10w40 on the track, but that is only after warming up the oil for about 15 minutes.
