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Message: <blockquote data-quote="TrickVert" data-source="post: 1537372" data-attributes="member: 8315">The 2006 TSB refers to more modern engines with tighter tolerances by stating "Machined internal engine parts are more precise than the parts of 20 years ago."  The design of the Ford 302 in our SN95 cars dates back to 1968, so those "tighter tolerances" don't apply.  Unless you run a 5L in *very* low temperatures consistently, or have a modified 302 with tighter-than-factory specs, modular motors are the first where I'd agree that the 5Wxx oils are beneficial and/or necessary. P. S.  The bulletin also seems to lean toward my 1 MPG being a fairly accurate guess 10W30 vs. 5W20.  You must drive a *lot* of miles for that to have a noticeable impact on your yearly fuel spend.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> P. P. S. My '95 makes 400 RWHP so the 42# injectors squirt a lot of go juice at WOT, and it also gets driven only about 2500 miles per year in fair weather.  Both factors contribute to my personal "don't care about 1 MPG" attitude.</blockquote>