Re: Engines that are prone to sludge

<johngdole@[EMAIL PROTECTED]
> wrote in message 
news:5987752c-4f1d-4983-866a-23127cf4257e@[EMAIL PROTECTED]
 7500 mile interval is not correct. In 2004 Toyota has lowered that
interval down to 5000 for ALL Toyota/Lexus engines while GM and Honda
pushed it to 12,000 miles during this period.

When I started to buy a Toyota, I asked about that sludging condition. 
They 
indeed
recommended a shorter than original change interval, and told me that in 
every case
that there had been a problem, the owner had not maintained the
recommended 
interval.

BUT, there were also some issues with the PCV system that were discussed
on 
this
newsgroup that may have also influenced the sludging.  IIRC, they had 
reduced the
ventilation action and that could well influence oil sludging.

I believe that our 2007 has a longer change interval than 5000 miles, but
I 
never let it
go so long anyway.