Originally posted by tiv: I've changed the oil the day before yesterday (from 5k mi old Castrol Syntec to new oil of the same kind). The car is a '97 Zetec with 155k, I've been using synth or blend since 110k, 5W30 always, changing between 3k-5k depending on traffic pattern.
I'm not consistent on the kind of oil,I pick it depending on my mood/wallet at the moment (synth or blend). Been using Castrol frequently (not exclusively) because it's cheap. I use Motorcraft filters all the time, FL-200 or FL-300 (Walmart gives one, dealer gives another, I guess they're the same. Both fits.)
At this oil change what came out looked as thick and black as I expected from an 5k / 3month old oil, nothing particular. After filling up with the new oil, the sound of the engine changed very much, I'd say for the better: much smoother idle, nicer sound. It changed so much that even a friend who occasionaly rides in the car noticed it.
I've never had anything like this before, and I'm quite puzzled. The engine is still in a good shape, doesn't burn or leak oil.
Any comments ? What could cause this ?
Thanks, Tiv
For about $10-$15 you can have your oil checked at a lab. Most the autoparts houses know where to send it. They do a whole range of tests, you might want to try this just out of curiousity and especially since you stated you noticed a marked difference in how yourengine ran after changing oil.
Ken, 99 Silver Frost SE Zetec Atx, polished alloys, Kumho's, Pioneer hi power CD/AM/FM. Factory spoiler (added) Audi side lites, Borla stainless steel muff. Stolen, recovered in pieces. Looking for another Tour, preferably V6, 5 speed.
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