I don't use anything but anneal the copper washer.
It seems that most sealing washers are supplied dead hard and aren't suitable for sealing. If you re-use a washer they have usually hardened so anneal & re-use.
I don't think I've ever changed the sealing washer on my Defender sump plug despite multiple oil changes.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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