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Blowing it out unnecessary Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Mon, 14 Mar 2005 09:32:12
In Reply to: Oil change interval for 7 mile commutes, tincob, Sun, 13 Mar 2005 19:12:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You really don't need to blow out the engine with high rpm driving. The turbo spins all the time there is exhaust flow. It's just that it doesn't spin really fast until you get a lot of exhaust flow and an open throttle. But even if you are at the top of the white/beginning of yellow, the turbo is turning, and oil is flowing. So don't sweat that.
I agree with Dean and Dick in FC (always a good thing to do) - once a year is probably fine, using a good quality oil. There is no need for high speed or high rpm driving. What you should do though is to take the car for a longer drive (30 minutes or more) every week or two, to burn the water out of the oil. Oil gets up to temperature and pretty much stays there. At that point, there is a rate that water boils out of the system. You want to give it time to boil out, and depending on how much moisture there is, 15-30 minutes should do it. Yes, if you really whang on the car, you can get the oil temperature higher. That would boil the water out a little faster. But the extra wear on the engine wouldn't be helpful.
I've got a '92 9000 that I got new, and has a whopping 65K on it. Some years it gets only 2000 miles. My commute to work is only about 8 miles. About every two weeks, I make sure I go on a longer run. Maybe it's 30 minutes on the highway out to the local shopping mall. Even Saturday morning errands will do it - it's getting the engine to temp, and keeping it there for a while that burns off the water.
Sludge isn't due to water, but due to the inevitable breakdown of oil, and the inclusion of combustion by-products. Using a better grade oil helps a lot - it is more resistant to break-down, and has more buffers to neutralize the acids from combustion break-down. If you're changing the oil every 5K miles with something good, I wouldn't sweat sludge. Even if the change is only every year. It's the folks that have 10K oil changes that have an issue.
As to a local place, when I worked in the area, I always had good luck with Saab Service of Orange (CT). I haven't used them in about 5 years, but they were a good independent that could do Saab authorized service.
posted by 192.249....
, Mon, 14 Mar 2005 09:32:12 <-- Viewing This Message
, Mon, 14 Mar 2005 14:11:28, Wed, 16 Mar 2005 06:19:49
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