Re: Engine Oil Spec for Longevity?
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3 of my little Ford Traders run Penrite Diesel 15W40 mineral here at the foot of the Vic alps throughout winter and Penrite Diesel +10 20W60 mineral in summer.
In the hotter temps the oil tends to thin out under heavy loading particularly driving at hwy speeds.
While the XF runs 15W40 year round.
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heritagestonemason.com/Fordlouisvillerestoration In order that the labour of centuries past may not be in vain during the centuries to come...... D. Diderot 1752
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