Date: Sat, 10 Mar 2007 00:21:33 GMT From: - Bob - <uctraingnospamanet.com> Subject: Re: SAAB 9-5 fluid changes
On Fri, 9 Mar 2007 16:05:16 -0800, "Richard Sauer" <chongkilnospamast.net> wrote: >> forever, >> it only needs topping up. > >Thanks. To give an example of how contentious the question of frequency of >oil change is ..here is what Deanna Sclar has to say in Auto Repair for >Dummies (Please no jokes)..."If you do a lot of stop-and-go driving in city >or rush-hour traffic, change your oil as often as every 1000 miles. Your >engine rarely gets hot enough to evaporate the water that forms in the >crankcase and builds up sludge in the engine. Some auto repair experts >believe that it's more accurate to determine how often you should change >your oil by the number of cold starts your engine experiences than by the >number of miles it's driven." If she is right, and I have no idea if she >is, that adds up to a lot oil. Nonsense. While short trips to require more frequent change intervals, no one with a clue suggests 1K changes. If you want some scientific facts, go out to bobistheoilguy.com and look into the guys actually testing their oil in labs. There are Saab engines running over 300K miles without major rebuilds on 3K dino and 5K synthetic changes. There's plenty of evidence to suggest that even that is more frequent than needed - see the guys testing oil (above). >On Coolant she says " You should definitely >change your coolant in two situations. The first is if you haven't changed >it a year or in the past 20,000 miles." A little shy, but not as bad as her oil claim. 2 years or 24K miles. The reason is that the anti-corrosive compounds can break down. Use Saab coolant. >Additionally she seems to be >suspicious of the manufacturer's recommended intervals for oil changes for >the simple reason that the manufacturer wants you to buy another car, and >steps to lengthen the life of your present car are not in the manufacturer's >interest. Total BS. Warranties are 100K on a lot of motors these days. They want them to last. Plus, if she was right, why don't the oil companies promote shorter change intervals ? Why don't auto mechanics working on their own cars go with shorter intervals ? > Keep in mind that many people have Sclar's book and it has become >a kind of bible for car owners. I am not holding this book up as a shining >example of truth. She might be right and she might be wrong. She's wrong. In fact she so easily promotes total supposition in the face of actual science that I would question anything else she says.