User 92421

i know the oil doesn't touch the exhaust port directly, but it cools the head which the exhaust port is part of so the oil indirectly cools that as well

oldb

New to this forum. I go through several hundred gallons of oil where I work a year. I am constantly comparing oils and reading oil samples. I ask a lot of questions of the suppliers, and call the oil tech lines often.
Far and away the best source of information on oils and oil weights is the web site:
bobistheoilguy.com there is more information there than you could ever need to know, a very interesting web site.

B

MustangForums Editor

here's another good resource on the topic...
https://mustangforums.com/articles/i...heck-this-out/

Derf00

Being at work without audio on my PC (with just really bad closed captioning from the video) it really seems like he's confusing the topics. Instead of using a 15W-40 conventional oil vs a 5w-40 Synthetic to talk about Viscosity AND protection. He should've used ONE weight for both oils then talked about it. Especially that pour test. Of Course a 15w is not going to flow as well at freezing temps as a 5w. That's irrelevant of whether it's a conventional oil, syn blend, or fully synthetic. It's the nature of oil and WHY they have a W rating.

To me, It would be more valid to do that frozen pour test with a synth and conventional of the same W rating. That's my nit pick.

wolfheads

I have a 2005 mustang gt and a 1973 Ford Maverick in which I have always used 20w40 in both. My question is, the mustang calls for 10w20 synthetic. Does the standard 20w40 cause issues? I'm thinking of going to the 10w20 synthetic next oil change.

David Young

What state do you live in? Must be 'hot' all year. I changed to 5w30 in both my cars (2011 v6 Mustang and 2014 v6 Edge Limited) but I use 10w40 in my 1991 F150. I live in Tennessee