Oils ain't Oils - well some are, especially these couple from Shell,
and they contain a hefty amount of good old ZDDP, specifically
formulated for the equipment they are used in.
Shell 'Nissan Oil 20W-50' is formulated for Nissan Dealers for all
warranty work on Nissan passenger vehicles (Globally) and has
significant concentration of ZDDP, 2 - 2.5 times the ratio of modern
spec mineral motor oils.
Shell Harvella T - this is a 15W-40 Universal Tractor Oil with very
high concentration of ZDDP, double the concentration of Nissan Oil,
and makes a good 'break-in' for standard passenger engine re-builds,
and for use in a gearbox that uses engine oil.
I use the Harvella T for the gearbox oils in my Landrover Series III,
Discovery and Range Rover as well as the MKIII Midget, and for engine
oil in the Kawasaki KLF300 quad.
I use the Nissan Oil in all my V8's, GM, Ford and Land Rover and of
course the Midget.
Not sure outside Australia and the UK, on the availability of these
products directly from Shell. But you could check with your Nissan
dealer. Happy to supply the oil spec sheets, or you can view at the
Shell web site.
cheerz....n
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