Discussion
Was Mobil 1 available back when it was new, what grade are you using?
If it's been okay for this many years I wouldn't be changing
VR1 is a popular choice for that old Rover V8 but it's a mineral oil whereas you've obviously been using a synthetic all these years.
https://www.opieoils.co.uk/p-73741-valvoline-vr1-r...
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