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Same or slightly better on Mobil 1 HM, I am added 1 quart after 6000 miles last oil change and it was full at 8500 miles, no oil under car but dusty oil around valve cover gasket.

Thanks for the UOA, looks like sticking with 5w30 HM is the way to go, I am trying to milk another 40,000 miles out without going overboard on maintenance as at some point it makes more sense to replace the van than put alot of money into it.

Both.

Minor valve cover gasket leak, not cost effective to change.

This will be the 4th oil change with synthetic after a lifetime of dino, the first run of synthetic was $1 a quart Mobil 1 10w40hm run for 4500 miles, came out the dirtiest I have ever seen, has been getting 5w30 HM since at about 8000 mile OCI.

I am trying to figure out the most cost effective version of Mobil 1 to use in a 2002 Toyota Sienna, it has 250000+ miles, the choice is between Mobil 1 HM 5w30, Mobil 1 5w30, Mobil 1 EP 5w30 and Mobil 1 0w40, I will run the oil 1 year and about 9000-10000 miles of 50/50 mixed city/highway miles.