Which are the best oils to use?

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Oil advice required:-
This is the spec of my Westfield kit car engine:-
1760cc X Flow engine built to custom stage four spec
Accralite forged pistons
ARP bolts throughout
dry sump
motorsport spec oil pump.
Cylinder Head fully gas flowed with modified ports with matched set of valve springs including big valve head and hardened valve seats
Cutting and throating of valve seat areas to accommodate bigger valves
Full engine balance Crankshaft reground and polished
All new mains and big end bearings
Decked pistons and block
Steel main caps and block line bored
High performance fast rally camshaft fitted
Its now done 1300 miles since rebuild. Any recommendations on oil spec and synthetic or mineral?

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Valvoline VR1 20W 50 mineral. IMHO synthetic oils are better suited to modern engines only.


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