XJ8: every 10K miles with NAPA synthetic.
SL500: every 8K miles or so with NAPA synthetic.
'95 Saturn: every 8K miles or so with NAPA synthetic.
'89 Subaru DL: every couple of years with whatever oil.
TR6 car: every few years (not too many miles these days...).
BMW K75: every 7.5K with Mobil I synthetic (dry clutch, separate tranny oil @ 10K).
Ninjette: we'll see... probably every 5K or so with whatever oil.
KLR250: we'll see... probably every 5K or so with whatever oil.
Honda riding mower: every 3 years or so with whatever oil.
Other mowers: just check/top up level, haven't changed in years.
Coleman 3KW generator: last changed during the Clinton administration, but check/top up oil level every major power outage.
Big-ass air compressor pump: every 20 years or so with whatever oil.
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