Several points: The manual (Owner's Hnadbook) specifies a range of viscosities dependent on ambient temperature ... e.g. from 5W-30W in very cold climates to 10W-60W in warm climates
Further: are you losing oil because of leaks or because the engine is burning it? I was going through a heap of oil and discovered it leaking from the sump bolts which were adjacent ot the cross bolts. I removed/replaced the sump using a 'rubber' gasket and putting Loctite thread sealer on all the bolts. Problem solved.
I currently use either 10W-40W Magnatec of 15W-40 Magnatec diesel in my 4.6. given that it's an "old" design engine. My personal view is that 10W-60W is too high.
This is a topic bound to stir all sorts of emotionsI try and stay away from full synthetics because of the flat tappet design. If the vehicle had roller rockers, I'd use synthetics.


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I try and stay away from full synthetics because of the flat tappet design. If the vehicle had roller rockers, I'd use synthetics.



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