Quote:
Originally Posted by Maxbumpo
I've (and many others) have had very good luck with Mobil 1 (full synthetic) quieting down noisy lifters, regardless of what weight you use. M1 has mild cleaning properties (as compared to regular non-synthetic oil) that I surmise helps to clean out the passages and valves in the lifters to restore their operation. It may take several thousand miles for this cleaning to have the desired effect. In addition, switching back to dino oil can cause the lifter tick to come back immediately, I've heard.
Speculating on which oil or which weight is better is just that; speculation. If you REALLY want to know, send a used oil sample in for testing. I think for about $75 you can get a set of four sample kits, all you pay after that is postage to send each sample in. In my case, I've got lab analysis to show that both 5w-40 and 0w-40 are just fine in my OM603 and OM606 engines, running extended drain intervals in the OM606. Unfortunately one cannot assume that the results of using any particular oil in anothers car will compare to the results you will get in your car. Driving habits, environment, engine condition, and fuel quality all play a role.
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Well that is good news. My feeling and I am not going to research it is still the synthetic oils may just have substantially larger molecules. Something has to maintain the oil cushion or wear results. The side thrust loading on the skirts of pistons alone is substantially greater than on gas engines. Same on crank bearings.
For example I would not put a 5w-40 normal dino oil in if they even sell it. Over time and many things you do arrive at the point of really understanding that the molecular size of fluids and gasses are very important. Large molecular size in lubricants is probably better than higher viscosity for example. Or produces a similar effect for practical purposes.