I have contacted Ford dealers and SVT dealers in Canada and they are all telling me that mobil 1 5W50 is now straight from Ford instead of motorcraft.. Is this the same in America?
is mobil 1 better oil?
is mobil 1 better oil?
I have 400 miles on my Boss now and I'm going to replace the 5-50 with Amsoil 10-40 at 500 miles.
I would consider waiting till at least 1k miles and you should probably also stick with 5W50.
Not to mention Ford seems to have choosen 5W50 for a reason, I am pretty sure that all oils will meet or exceed their standards, however if you use something different I am sure they will be able to tell and void your warranty.
See the link below for how well amsoil holds up compared to the motorcraft....
http://www.svtperformance.com/forums/svt-shelby-gt500-150/787413-official-uoa-thread-oil-poll.html
because I have heard of people doing what you are thinking about doing, and their motors shooting craps because they didn't leave the break in oil in long enough.
What break in oil? They are filled with the motorcraft 5W-50 at the factory. I always get a kick out of people saying don't change your oil too early or too often, like it's a bad thing.
It may hold up better but then switch to a good 5W50 instead of changing the viscosity.
It was my understanding that the 5w-50 held up better under the higher RPM the Boss motor turns over the GT. Lifter bleed off & such....
Not to mention Ford seems to have choosen 5W50 for a reason, I am pretty sure that all oils will meet or exceed their standards, however if you use something different I am sure they will be able to tell and void your warranty.
Another great and informative post Beast! I have the utmost confidence that my Boss is getting the best protection and performance from Amsoil SS 10-30, and Amsoil 10-40 for road racing.
I also use the SS 10-30 in my 408 stroker in my GTO, which is built with looser bearing clearances, and my oil pressure is perfect. I would never run a 50 weight for normal street use in a tighter clearanced, factory engine, because oil pressure would be too high.
Why use a 10-30 vs a 5-30. i do not know much about oil rating but if i were to change to a mobil1 or amsoil 10-30, i guess i would like to know the reasoning. I dont understand what the first number is in the rating.
Would one of the oil gurus comment on Redline 5W50 in terms of suitability for replacing Motorcraft.
Thanks in advance.