Date: Thu, 2 Jun 2005 10:50:16 +0200 From: "Henrik B." <saabnospamPAM_tdcadsl.dk> Subject: Re: warranty
"Malcolm William Mason" <mwm1(spam)nospamedu> skrev i en meddelelse news:ehet9190a0m0hjpl4tntkn2mmnong0pm7inospamcom... > This week I receive a letter from Saab USA stating that a small > percentage of certain Saab engines could fail due to oil"sludge" > accumulation. > Does anyone have any insight to offer? Hi Malcolm. The problem is, that on the newer Saab-engine (I4 with Trionic 7), the pistons are smaller (and lighter). The piston rings are also smaller. This all to reduce internal weight and resistance, to reduce fuelconsumption. This means that during (cold)start, there's more gasoline running by the pistons, down into the oil. This wears the oil a great deal, so that the oil begins to build sludge. This sludge doesn't lubricate very well, and kan cloack (spelling?) the oilfilter, oilpump and so on. Saab has tried for the last 5 years to solve this problem, by introducing different types of oil-filtering-systems on the inlet-side, which obviously isn't the right way to go. As the problem occurs due to the coldstart issue, the problem mainly effects cars with at lot of coldstarts - short trips. On a longer drive, the gasoline in the oil will have time evaporate. What you need to do, is change the oil (and filter) every 5.000 miles. And keep and eye on the oilstick - to check for sludge. Use a good fully-synthetic oil - 0W-30 or 0W-40. This will keep you a happy Saab-driver for a long time. :o) Cheers!
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