What about the new "high milage" oils ?

I have found that the "long life" and "high milage" motor oils are generally thicker than the others of the same rating. The 30 wt is almost as thick as a 40 wt. The 40 wt is almost as thick as the 50 wt.

I believe the reason they offer such brands is because of the way owners manuals are written. It states you should use a particular oil for the cold of winter or the heat of summer. There is no recommendation for when your car gets high milage on that odometer. At some point you will need thicker oil. If you buy that "high milage" stuff. It will in fact be thicker but still be within the written specs. of the owners manual.

aehaas

 

Any thoughts on the new (?) mobile 1 0w-40 for european cars. I know you were recomending the racing 0w-30, but I could not find it localy.

I just changed the oil last weekend to the 0w-40 Mobile1. I used to use 15w-50.

I noticed no change in pressure at revs or idle. I may be psychological, but it may even rev a little easier.

 

this is interesting. Thicker oils do not leak as much. I've put grease in tunneling machine gearboxes that require 90 wt first the 00 then grease. Then rebuild. It's the same for motors( though on a different scale), if you have to put thicker oil in eventually you will have to fix what is wrong, but you can delay it for quite a while with no harm done. The most important thing is to make sure that there is some lubrication in there.