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Mine "used" more oil with M1 10W-30 too. I am in Texas and switched to 15W-50. Consumption is lower, maybe a quart per 3k mi.
My indy worked at the Lexus dealership, maintained a lot of LX450s and said many trucks used oil even when new. Not to worry too much.
I would definitely do some analysis with the different oils and viscosities before declaring it needs serious work.
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Robert Callaway
'03 LX470 52k mi. - The Smooth Ride
'94 FZJ80 212k mi. - Locked, OME 861/862, less the OE roof rack, add a D31M
'85 FJ60 - Sold
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