The Helix Ultra is one of the best oils that money can buy. I have no recommendation beyond that...but has it always been run on Helix Ultra? PCV systems tended to get clogged on this engine if they've been run past the oil's life...in the case of Ultra, that's a long time, but I am curious how the Previous Owner treated it...
10,000 miles should be about the limit for the Helix Ultra...it can look clean but still be used up. It's a question of how much base is left to neutralize the acids...and that's not related to color. I would change it on the factory recommended schedule for your country...
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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