Which engines had sludge prob?

Which owner didnt change oil? Find that person and you'll find the engine with sludge, unless Charlene has sold it by now?

Not the Tundra. The engines is question were:

Note that even some of these engines with regular 5000 mile oil changes, as recommended in their owner's manual, but maybe a lower quality brand of the correct spec API-SJ oil are said to have developed the sludge.

Ken

Hmm. That last part about the oil quality strikes me as suspect.

If I had to guess, the vehicle in question more likely from a demographic unit whose profile includes people who (a) don't tend to take good care of their cars, and (b) _do_ tend to lie about how well they take care of their cars.

I'm not going further than that. That is dangerous turf in _any_ direction, and I've probably said too much already... ;^)

Tom S