Quote:
Originally Posted by fivepointnine
for some unknown reason the PO of my car is running 10/30 castrol edge......I am getting that crap out of there ASAP.......its weird too because he actually knows alot about the boxsters and cared for it well (water pump, updated RMS seal as a prevention, updated IMS bolts, clutch, etc) I just cant figure out why he ran that oil
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There are other schools of oil though which say thinner is better to get maximum oil flow on start up and oil flow is the primary lubrication mechanism. The rational being that 90% of engine wear occurs on start up and oil flow us better with thinner oil. They would say 0w40 is better than 5w40 for start up. I don't recall high temp track senarios.
This "school" also feels that residual film strength is not helpful. It is oil flow that dies the lubricating.
I am just recounting what I have come across so please don't jump on me.
I like like to rely on solid test results and direct wear measurements. I don't have that for any oil.
I myself run a motul 5w40 on the advise of those in the Porsche community that have done some testing, and personal experience.
The IMS bearing may it's own specific lubrication needs that trump the rest of the engine and it's wear.