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Sunoco 260 GTX and GT Plus at the track and oil analysis M1 15W50

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Sunoco 260 GTX and GT Plus at the track and oil analysis M1 15W50

 
Old 06-11-2019, 02:07 PM
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edster75
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Default Sunoco 260 GTX and GT Plus at the track and oil analysis M1 15W50

This is my second year of HPDE's at the Autobahn Country Club in my 2016 A8 Z06. They have Sunoco 260 GTX (98 Octane) and 260 GT Plus (104 Octane). Both fuels are unleaded. I've tried both of the fuels because the difference in price at the track is only .50 gallon. I also have the GM 100 octane tune. Most of the track days last year were 85-95 degrees and humid. Occasionally I get a check engine light but I've never scanned the car to find out what the code is. It usually goes off after a few drive cycles. The car has been running great with no overheating or limp mode. I do run in M mode and try not to rev past 6k.

I recently had a oil analysis from blackstone and it had some lead (48ppm) in it. In the comments section they mention the use of leaded race fuel as a possible source for the lead. Both fuels are unleaded so I'm not sure where the lead would be from. Blackstone did mention that even unleaded race fuels sometimes have a little lead in them. So I checked Sunoco's website and found out that the 260 GX Plus is actually oxygenated fuel. They also mentioned that lead could be from bearings, but our cars don't have lead in the bearings they are polymer coated, and all the other metals looked very good with M1 15-50. I'm attaching the oil report incase anyone is interested.

I don't think I should be running oxygenated fuel in my Z06 with basically a stock tune. What do you guys think? I was also thinking that might be the cause of the check engine light. Although I don't remember if the light came on with the oxygenated fuel or not.

I also have a white tint on the inside of my exhaust pipes instead of the usual black. Would that be an indicator of a small ammount of lead present in the fuel?

Thanks in advance!







Last edited by edster75; 06-12-2019 at 09:37 AM.
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Old 06-11-2019, 02:56 PM
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Old 06-11-2019, 05:21 PM
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I doubt the lead would have come from fuel.....you only get traces of fuel in your oil and there would only be a trace of lead if any in the fuel. I think the cam bearings are aluminum, so I don't think it comes from there. Is it possible you got some cross contamination from where you put the sample in??
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Old 06-11-2019, 05:54 PM
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I don't think I had any cross contamination. I let some oil drain out and put the sample container in the stream and filled it about half way. They have a pretty nice sample kit, btw.

I forgot that toward the end of last year when I had the alignment done that the shop checked the code. It was a P0121 Throttle Position Sensor Fault.

The car is stock besides a BMS Filter, Mamo PTB, Akrapovic exhaust with catless xpipe, and the GM 100 octane tune.

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Old 06-11-2019, 06:14 PM
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I don't understand your concern regarding oxygenated fuel with the 100 octane tune. The 260 GTX has no ethanol; 260 GT Plus is only 13 percent. That's just a touch more than what you would find at the corner gas station at 92 octane.
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Old 06-11-2019, 07:02 PM
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https://www.sunocoracefuels.com/fuel/260-gt-plus

https://www.sunocoracefuels.com/fuel/260-gtx

Oxygenated fuel needs more fuel flow. I'm not sure if the stock tune would compensate for that.
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