Re: Engines that are prone to sludge

I think that's correct. And is precisely the reason that Toyota
downgraded the oil interval from 7500 to 5000 miles in 2004. Otherwise
they'll have to re-certify with EPA.

Given that, I think today's Toyota/Lexus engines are just as likely to
sludge as the ones introduced after 1997 (with the then new LEV
certification).



On Jul 28, 4:34=A0am, "C. E. White" <cewhi...@[EMAIL PROTECTED]
>
wrote:
> I've seen this theory before, but it makes no sense since the heads
> were not changed as you claim. Go check out the Toyota parts catalog
> sometime and you'll see it is a bogus theory.
>
> Toyota does not specifically "recommend" synthetic oil, at least in
> the owner's guides for new cars (just looked at the OG for my Sister's
> 08 RAV4). They did stop saying not to use it however (one of the old
> Toyota FAQs recommended against using synthetic oil - I have no idea
> why). And since they do recommend 0W20 oil, I guess they are defacto
> recommending synthetic oil, since as far as I know all 0W20 is
> synthetic.
>
> Ed