Does anyone have a Classic Mini Cooper Rover, Morris, Austin model 2000 or older??
What oil use the Mini Cooper Made in England 1275cc???
The manual ONLY say "use an oil 5W-30, but not say MINERAL or SYNTETIC.
The original Mini spec'd 20W-50 in the BMC engine due to the gearbox sharing the oil with the engine but that was back in the 60's and 70's.
If something has changed since then continued production into the 90's. If it says 5W-30 it doesn't matter if you use mineral or synthetic.