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My 2006 Toyota Tacoma v6 is losing profuse amounts of oil although it runs just fine after adding more. I did a comprehensive overhaul several years ago and tuned the valves (ground them and readjusted tapets AKA lifters) but I just lifted the valve cover and redid the feeler gauge test and one (out of 4) tapets on one cylinder has too much spacing between it and the camshaft. The same cylinder (I believe) also fails the cylinder leak down test, the pressure inside the cylinder being lower than the compressor.

Could too much spacing between the camshaft and one of the tapets cause oil to get inside the cylinder from the camshaft chamber under the valve cover?

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    My thinking is, No. There really isn't a correlation between the two. The only way oil can get into the cylinder from the head side is past the valve seals. It really doesn't care how much clearance there is between the cam and lifter.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Aug 6, 2021 at 20:57
  • How do you know the oil is coming from the top end? It could also be past the piston rings, through a break in the head gasket, or via a crack in the block or head.
    – jwh20
    Aug 6, 2021 at 21:06
  • @jwh20 because it started happening right after my tuneup and I didn't touch the engine block including the pistons and rings.
    – amphibient
    Aug 6, 2021 at 21:09
  • @jwh20 but I don't really know, just asking
    – amphibient
    Aug 6, 2021 at 21:09
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    The condition of the spark plugs should give you an indication of why cylinder is burning oil, if that is what is happening. If one looks black and sooty or oily, you know which one is causing the issue.
    – HandyHowie
    Aug 7, 2021 at 7:49

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