Wish the Nowak rating was a bit lower though. Some of Motul's stuff has been reformulated as well but the X-cess seems to be identical. I used to be a big Royal Purple guy as their oils worked really well in my high hp big single turbo RX7 (rotary) but over the years, they've reformulated their products, as many have, and they don't have the same specs any longer. The Redline Euro blend looks really good too but at $12.95 a quart, I decided to give it a pass this round as I did Motul's Sport 5w40 as it cost about the same.
#Motul xclean vs xcess full
I full change with a full sump is 9.7 liters. I drained about 9 liters using the extraction method. If you divided up the low to high gauge, I'd say it was at 2 out of 10. When I drained my oil yesterday, it was close to the low mark. A less than perfect PCV system can cause more oil consumption. I considered the extra consumption was maybe related to the car wearing with age or the fact I'm living more at the higher end of the tach which is why I'm switching back. I plan on using LM for my next oil change. Tech sheets for the various oils mentioned above I think this is the big detriment to the OEM Castrol which seems to have a higher Nowak rating which doesn't help when it comes to carbon buildup. But the best part is the Nowak rating is only 4.7% and it has a very slightly higher VI and viscosity at 100C.
It'll work in a road-driven vehicle over an extended interval unlike the 300V and it's a true Ester base. My next oil change, I'm going to try the Motul Sport 5W40 which basically sits between the 8100 line and the 300V line. I don't care much about winter performance as it doesn't get super cold here. I decided to try the X-cess as it has good viscosity at 100C, a Noack rating just below 10% and a high VI. In the end, I decided my prior experience of very little oil consumption with the Motul pushed me back in their direction after looking at a host of options from Pennzoil, Castrol (OEM), Mobil 1, Redline, etc.pouring over all their specs and taking price into consideration. I'm not sure if the 8100 falls into that category but from what I understand, it's a higher "grade" than even the Specific. I also read about Motul loosing a lawsuit in Europe recently as some of their formulations were using group III oils and not true group IV synthetics. I did a ton of research and spent quite a bit of time on the "Bob the oil guy" web page until acronyms made my head explode and left me with a less clear path to well, clarity. I decided to switch back to Motul, this time the X-cess 8100 5w40. With Motul, I'd had virtually zero oil consumption with the exact same driving habits. Car ran fine, engine was just as quiet overall but my oil consumption went from zero to about 1 liter in 5,000 miles.
My last oil change I decided to make a switch to Liqui-Moly, specifically the 4100 Top Tech 5w40. I've used Motul since day one of ownership of my RS5 and had been using the Specific 502 00 5w-40 and the X-Clean 5w-40.
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