Are the deposits from high SAPS? Or the increased calcium? I think I would have to do a very detailed brand/additive comparison before condemning an A3/B4 oil on the basis of SAPS.
I’ll keep you all posted on this, as the XC just rolled over 266,000 miles on the original engine. It’s been drinking about 1 quart (liter) every 1,500-2,000 miles for the last several years. Compression and performance are still good.
I’ll take a look when I change the plugs 4,000 miles from now.
But I just committed to keeping the car for a while with an entire suspension rebuild, spring replacement and timing belt.
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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