02-06-2006, 09:20 AM
|
#44
|
Mustang owner since 1970
Join Date: Aug 2003
Location: Charleston,SC
Posts: 6,243
|
Re: Important Information About Mobile 1 Synthetic Motor Oil For Mach 1's
Quote:
Originally Posted by E-MACH
I wonder about this one. What's the problem with using 5w30? At cold start-up they are both 5w spec for fast lubing, so what's the difference? I know the book calls for 5w20, but since the mod motors run so flippin hot, having 30w protection once it's hot seems to make a lot of sense to me. Motorcraft makes their specified semi synthetic in both multi-weights. Any input would be appreciated. Motor oil is still a dark science with so many authorities claiming cosmic wisdom.
|
Today's motors like the DOHC 4.6 are built to much closer tolerances than engines in the past and 30W oil is too thick in many cases. When you get a couple hundred thousand miles on it and continue to use it as a daily driver and aren't concerned with performance as well as the engine has worn and loosened up consistently, then by all means use the heavier oil.
|
|
|