Join Date: Jun 2009
Location: Inverness, Florida
'99 Elantra Wagon
'03 Kia Sedona
Mentioned: 5 Post(s)
Quoted: 69 Post(s)
Synthetic is great and it doesn't degrade very much. It's especially good when it gets a little old. But because it has more detergents, it will clean out gunk and metals, thus clogging the oil filter faster. The recommendation is to still change the filter every 3000 miles and add some new oil to make up the loss. This ensures that there is still plenty of detergents, the oil remains clean, and the filter continues to filter like it should. It is not recommended to break in the engine with synthetic, however. Better to drive the first year with dino oil. I switched to synthetic, change the filter every 3000 miles, and expect it to last 10,000 miles.
It's not recommended to switch to synthetic if your engine is old, and you didn't change the oil enough or on time. The harsh detergents will loosen the gunk deposits and clog your oil ports, leading to all kinds of problems.
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