Originally Posted By: greenjp
Originally Posted By: cchase
AEHaas and running 20-weights in Ferraris is quoted far too frequently on this board as an "excuse" for people to always recommend that it's okay to run ridiculously thin oils in vehicles. His experiments are hardly representative of the "real world" masses... in my opinion.
I think you protest too much. The OP asked if he would "hurt" his engine. There's a lot of evidence out there indicating he won't, AEHass' Ferraris and my old Civic included. Nobody's saying anything about running "ridiculously thin" oils, and besides considering how frequently a 30 shears to 20 over the course of an OCI a lot of people effectively doing it already.
jeff
Running a 20 in a vehicle specced for a 60 seems "ridiculously thin" to me.
In any case, just because in one application a UOA came out okay doesn't mean it's good to tell people to run 20 weights in a vehicle specced for a 30 weight.
At best it does nothing at all and at worst it could cause elevated levels of wear.
The argument that many 30's shear to 20's has some significance perhaps, but typically it takes 5000 miles or more to shear to that level, which isn't the same as running a 20 weight from the start.