Quote:
Originally Posted by Lemmy
Why would my owner's manual call for 5W-50 synthetic? It is a 2010 and although I'm sure the tolerances are tighter now in 2014, there is a pretty big difference between the 5W-20 conventional my 2011 GT called for and the 5W-50 synthetic used in the 2010 Shelby GT500. Why such a huge variation of oil for both having V8 engines? Not baiting or trolling you; I would really just like an opinion. Thanks.
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http://www.svtperformance.com/forums...akes-5w50.html
Track pack use also recommends 5w-50 for 2013+. This is a peculiarity with the Ford engine design IMO. For us, I think its whether to use a synthetic 5w-30 (some viscosity improvers) or 10w-30 (often no viscosity improvers).
I use Mobil 1 turbo diesel truck in our 2004 Land Rover V-8, which has a flat tappet cam and specs a 40 weight. Best oil around IMO if looking for a 40 weight.