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We had found issues with carbon generation with the X-Cess oil in some direct injection applications. Yes, we have switched many of these cars over to the X-Clean EFE 5W30 oil. So I also reached out to IAG to confirm this fact and this was the email I received today from Adam at IAG: From an oil weight perspective a 40W oil is only of value at the track, but for the track use a synthetic 10W-40 oil and consider an oil cooler. They informed me that after some discussion with IAG they switched to Motul 8100 5W30 X-Clean EFE for their DIT applications because an additive in the X-Cess was causing carbon build up on the pistons. I've run it, but like Rotella T5 / T6 because it's less expensive. Turns out Bren Tuning also was experiencing issues with a high HP WRX they worked on also running the Motul 8100 5W40 X-Cess. Authorized Retailer for: P&L Motorsports. Switched to Motul for it's HTHS and low/mid SAPS properties.
I switched to this oil from Eneos 5w30 since I wasn't comfortable with the low viscosity result I received from the first sample I submitted.
#Motul xcess vs xclean wrx manual
So I made an appointment with Bren Tuning for the 30k maintenance for: Walnut Blasting/Tranny Svc/Rear Diff Svc/Spark Plugs/oil change. If you were asking about tranny or rear end oil, I do recommend Motul. Figure it's cheap maintenance vs letting it run to 6000 like the manual suggests. The past few months I was experiencing some unusual detonation issues that even resulted in my DAM dropping. I have been running Motul 5W40 X-Cess 8100 for about 30k miles.