Quote:
Originally Posted by jaykay
I am using 5W40 motul 8100 x-ess. Actually, I have experienced much less lifter noise/engine clatter on start up than with 0W40 M1. Perhaps this is down to more oil film retention (due to the higher viscosity) and availability on start up. Valve train and lifter tick are are sounds that are very rare rather than a regular occurrence with 0W40. Whether this translates to reduced engine wear is another story but it sure does sound like this would be the case. If someone could direct me to the oil flow case article, it would be much appreciated.
I also track the car and only drive in summer. The thicker oil made sense to me.
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I used Motul 5W-40 Xcess for 3 oil changes after the factory fill, but still had noticeable valve train noise on startup. I never used M1 0W-40 as I use that oil in the wife's MB E320 and there's always startup noise. I went with M1 5W-40 for two oil changes but had valve train noise again. I just recently went with Redline 5W-40 and the valve train noise is virtually gone. BTW, the UOAs on the Motul and M1 5W-40 oils were good, it was just the noise that bothered me.
I called Redline and they told me that their product is higher in ester than other PCMOs. Since ester is a polar molecule, it will stick to metal parts.
Regards,
paul...