0W Mobil 1 - Engine oil

[jaykay]

yeah .....lifter clatter is something i often note. if crank the engine before starting it tends not to be there

[Paul]

The last I checked the stock IMS rear bearing is not lubricated by engine oil.

[Cloudsurfer]

Originally Posted by Paul

The last I checked the stock IMS rear bearing is not lubricated by engine oil.

It's not supposed to be, but the theory is that engine oil gets inside the IMS tube and washes away the "sealed" lubricant, thus leaving engine oil to lubricate the bearing (however, without sufficient flow to carry away deposits, hence why it is argued that more frequent changes are good).

Modern Mobil 1 is not what it used to be. IMHO, there are better oils out there.

[jaykay]

yes I thought it was sealed too...

[JFP in PA]

The problem with 0W-40 Mobil 1 is the product’s inability to hold up under high temperature/high shear environments and “stay in grade” as demonstrated by used oil analysis. While the IMS from the factory is a sealed unit and its problems are not directly related to the oil’s performance (other than to the fact that the low viscosity of the 0W Mobil oil could hasten the oil intrusion into an already failing IMS bearing once the seals start to crap out), a lot of other engine components are directly affected by the product’s poor performance and limited ability to “go the distance”. In light of the fact that there are better oil selections available, the continued use of clearly inferior oil seems questionable……

[Paul]

Originally Posted by JFP in PA

The problem with 0W-40 Mobil 1 is the product’s inability to hold up under high temperature/high shear environments and “stay in grade” as demonstrated by used oil analysis. While the IMS from the factory is a sealed unit and its problems are not directly related to the oil’s performance (other than to the fact that the low viscosity of the 0W Mobil oil could hasten the oil intrusion into an already failing IMS bearing once the seals start to crap out), a lot of other engine components are directly affected by the product’s poor performance and limited ability to “go the distance”. In light of the fact that there are better oil selections available, the continued use of clearly inferior oil seems questionable……

Tired of red but I appreciate your input on this board.

[Blue-S]

My 2000 Boxster S owner's manual lists 10w40 synthetic and 15w40 conventional oils among the recommended types & viscosities. If it was OK then, why is it not OK now? Answer: 0w40 skews toward reduced fuel consumption. Since I am not focused on attaining the absolute minimum fuel consumption on my Boxster, it will most likely receive 10w40 syn on the next oil change...unless I go with 15w40 Swepco.

[TRawls]

Originally Posted by Paul

The last I checked the stock IMS rear bearing is not lubricated by engine oil.

Is this something that you check frequently?