Mobil 1 15W-50

[DavidP]

Is anyone using Mobil 1 15W-50 on the track? Comments?

[Subdriver]

David,
A lot of SCCA T1 drivers use that oil. I used it all last year.

I switched to AMSOIL Series 20w50 this year based on some comparative testing I found over the winter. My oil temps are about 20 degrees cooler this year in comparable ambient temps (mid 90s).

Note, this isn't one of the oils recommended by AMSOIL for the C5/Z06. They recommend one of these:
Series 2000 Synthetic 0W-30 Motor Oil
SAE 5W-30 Synthetic Motor Oil
SAE 10W-30 Synthetic Motor Oil
SAE 5W-30 XL-7500 Synthetic Motor Oil

In the high ambient temps I race in, I wanted a heavier weight oil, so I am using the 20w50. I may switch to the Series 2000 0w30 as the weather cools off.

Also note, I do not know if Mobil 1 15w50 or AMSOIL 20w50 meets GM spec 4718M, the requirement for the engine oil. If not, there may be a warranty issue. As I was and am racing, warranty coverage isn't an issue for me.

You can find the recommended AMSOIL products for your particular vehicle here:
AMSOIL Online Product Application Guide

P.S. I have asked the AMSOIL Technical staff if the Series 2000 20w50 meets GM Spec 4718M.

[DavidP]

Thanks Subdriver. My oil temp. was 284 at 90 degree ambient temp. here in northern Texas using Mobil 1 10W-30. I will be installing an oil cooler before going back on the track. Would really be interested if Amsoil Series 2000 20W30 meets GM specs. Anymore pointer's you have would be appreciated. I run the GM UPF-44 filter.

Thanks for info.

[PowerPro01]

Not that it's Z06-specific, but I use it in my Stage 1, modded for the street, and since '99, the engine runs flawlessly in at conditions including idling/cruising...
It's hooked to a Turbo 400 with a 2800 stall converter, so operating temps CAN get "excessive"...

[Subdriver]

P.S. I have asked the AMSOIL Technical staff if the Series 2000 20w50 meets GM Spec 4718M.

Been a busy last couple of weeks for me, sorry for the delay on this.
AMSOIL has confirmed that the AMSOIL Series 2000 20w50 is suitable for the Corvette. While I wouldn't recommend it for daily driving, it is great on the track. Oil temps at Gateway in 90+ degree weather at last weekend race were around 245.
Note: I do have an external oil cooler and DRM radiator.

If you are interested in buying AMSOIL at wholesale, please PM or email me at c66racing@hotmail.com
Thanks for your support.