I saw a similar situation when I worked at a Nissan dealership.
Guy had a Pathfinder with a 3.5 that took a tiny filter.
He got conventional oil and left it in longer than he should have.
Switched to Amsoil at 40k and went right for 10k intervals.
Must have loosened up some sludge and overloaded the filter.
Brought it in because the oil pressure light kept coming on.
Filter was full of sludge, and I think it had been bypassing for a while, oil looked like molasses.
We changed his oil and filter and his pressure improved, but he did permanent damage to the engine. It burns a good amount of oil, and is noisy and makes all kinds of death rattles.
I certainly wouldnt blame it on Amsoil, but I don't believe in these 10 or 12k oil change intervals either. 7k would be my limit in ideal conditions!
Guy had a Pathfinder with a 3.5 that took a tiny filter.
He got conventional oil and left it in longer than he should have.
Switched to Amsoil at 40k and went right for 10k intervals.
Must have loosened up some sludge and overloaded the filter.
Brought it in because the oil pressure light kept coming on.
Filter was full of sludge, and I think it had been bypassing for a while, oil looked like molasses.
We changed his oil and filter and his pressure improved, but he did permanent damage to the engine. It burns a good amount of oil, and is noisy and makes all kinds of death rattles.
I certainly wouldnt blame it on Amsoil, but I don't believe in these 10 or 12k oil change intervals either. 7k would be my limit in ideal conditions!