Date: Fri, 24 Feb 2006 07:46:04 -0500
From: Fred W <Malt_Houndnospamm-me-not*>
Subject: Re: Sludge and Flush

Pooh Bear wrote: > > Jo Anne Coyne wrote: > > >>Hi, all. >> >>We have a '99 2.3L approaching the end of its basic warranty life. It is not >>showing any sludge symptoms yet. However, if sludge develops down the road, >>I'm worried about Saab honouring the extended warranty, and doubt the >>various claims of oil additives. More aggressive treatments like ATF are >>scary. >> >>Can anyone tell me if there is a safe, effective, flushing fluid that will >>purge an engine of sludge? > > > It's a bit much to expect an addtive to *purge* an engine of sludge but there > are many flushing additives available here in the UK that can be used at oil > change time to help prevent the build-up of deposits. Also consider draining and > refilling with flushing oil before finally draining and re-filling. > > Use of synthetic oils will help greatly too. > > Graham > All good advice, but if we go back to the OP, it specifically says there is no sludge now (yet), at least none that the poster is aware of. Considering that, I would stay away from the "flushing chemicals" and just adopt a preventive habit of (more) frequent oil changes with a good synthetic oil. One thing about the SAAB 4-bangers is they only take ~4 quarts of oil at a change. Compare that to my BMWs that take 8 quarts and you can deduce that the oil will take more of a beating in a given mileage, and it will be half the cost when you do change it. As a point of reference, I routinely change the oil in both of my 1998 2.0L 900's at ~5k mile intervals (daughters cars). The BMWs go a bit longer (~8k miles) between changes. -- -Fred W

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