Motor oil weight for triton v10

WILDEBILL308 wrote:

427435 wrote:

bigbaddad wrote:
In 2009 at Hershey I asked the Ford guys why the 5-20 as opposed to the 10 - 30 I had used in general for many years. They smiled, said they loved all the stories they heard, but for the V10 it was mainly needed for engine tolerances which were tighter than in the past.

While the tolerances are tighter, the MINIMUM clearances are not.

With improved machining that provide tighter tolerances, the maximum bearing clearance will be smaller, not the minimum clearance.

The reasons they smiled was that they weren't going to tell you it was about CAFE mpg.

You can try to spin this any way you want. We are not talking machining tolerances. Yes I know the difference. We are talking about the oil gap between the bearings. The V10 rod Bering gap is from 0.0011 to a maximum of 0.0023. Now given that the oil is a major contributor in keeping the lower end cool and you need a fairly good rate of flow to accomplish this why would you insist on not using the right oil. I would be using Mobil 1 0-20 if it was my engine.
Now can you tell me how many thousandths those numbers represent?
Bill

Could not resist; Just for grins i looked up the rod bearing clearences for a Ford 351ci, and a Ford 390ci: both .0008-0015. This is in 1969.
So--I guess, tighter tolerances yes but tighter clearences not.