Im going back to mineral oil now. I have recently have two cams (nobe) and lifter breakdowns and used two different synthetic oils. First 15-40w penzoil and after that with another cam and lifters Mobil 1 5-50w synthetic.
Now Im going back to mineral oil. Going to buy 20-50w tomorrow. Read that this oil is good to -10 degree and my car never runs in that cold wheater.
I have also got back to standard cam and lifters from Ford. Hope this will do it now. Im pretty pissed of taking my phone on the high way to get someone to get me.
BR Butchi