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QUOTE (lovemysantafe @ Jun 5 2010, 08:23 PM) index.php?act=findpost&pid=330148
When I made the switch from dino to full synthetic, I did some tests on how long to go in between changes. I've always believed that 3,000 miles is much too soon to be changing out the oil and so I decided to try out the 7,500 mile interval. By the time I hit 6,800 miles, the car wasn't performing well, had troubles starting and was returning very poor mileage. I chickened out and changed the oil right away and all the problems went away with it. I now change the oil and filter every 5,000 miles using Mobil1 10W30 (per the manual for my area's climate) and a genuine Hyundai oil filter.

I switched at 50,000 miles and I'm now at 140,500 and have had no ill effects from it.
Interesting that this is more or less what has been learned by bitter experience by SAAB owners like us. Regardless of what the manual says, smart owners change using Mobil 1 0W-40 and a quality filter, and do it every 5K.
Our Hyundai '09 Santa Fe comes to us as a babysitting job for a son's family transferred overseas. While we won't be putting anything like 5K on it in 6 months, I plan to change at that time using M1 5W-20 or 5W-30 and the Hyundai filter.
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