Cummins Blue diesel oil because the diesel oil has more zinc that most petrol engine oils. The diesel oil is high detergent and might help to un gum your oil rings (which sounds like the problem to me?)
If not then a mono 30 grade oil high in zinc (important) The zinc has been largely removed from petrol engine oil for "enviromental" reasons.
Do some research to bolster your choice.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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