I usually go by mileage and not the OLM but for the G8, I actually did simply wait until the light went on. That car took almost 9 quarts of synthetic so I figured following the OLM was fine. For the Lex, I've done it every 5k with synthetic and we are around 188k now.....
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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