@doublechaz & @whitexc thanks for the replies, appreciated.
1) No unusual clutch slippage whatsoever, No unusual rpm changes etc, smells like burning oil.
2) 1st event: long hard drive through mountains: smoke near firewall, 3"d. black oil on ground, low transmission oil level (I then filled it), then lots of highway driving no issues, other than small drip leak.
3) Steam cleaned engine (very dirty) to reveal leaks, bolts tightened, ground leaks stopped.
4) Now, new leak evident on exhaust, still clean up top. Burnt smell enters cabin at rest (like ever present cold start gassy smell).
5) FYI: current 225K, Head gaskets at 101K, transmission rebuild at +/- 170K
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