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I suppose the pertinent quesion is how did it run before you replaced the timing chain?
How many miles on the engine?
If the valves are adjustable, when was the last time it was adjusted?
Regarding oil, what does the manual call for? You can't run thicker oil in cerain engines because the lifter holes are metered to certain weights of oils. For instance if you change the oil on a Taurus that calls for 5w20 and use 5w30 in its place, the valvetrain will clatter.
So it really depends. However, most engines have a variety of oils they can run depending on ambient temperature.
The last one that also matters is how do you drive? Realistically. Don't say you drive like grandma when you're between 3500 and 5k most of the time. That reason alone is the most important. If you drive spirited, it's better to run a thicker oil.
In most of my cars, especially ones with higher miles, I've always ran Catrol Syntec (Edge, whatever they call it now)5 w 50.
On most days I will hit the redline on a car. Not all the time, but often enough to where I need a slightly thicker oil. I've never had a problem with it, and even on some older small block Fords (302, 351, 289, etc.)it brought down operating temps.
Definitely recheck the timing, however, we don't have enough info. As mentioned above, if it is supposed to have a valve adjustment done, and hasn't had it done, it can easily cause running problems.
My friends Civic dropped a cylinder completely.
Perhaps he was trying to fix a noise in the valvetrain the whole time and thought that maybe the chain was stretched and out of time.
2000 E55 AMG 426HP/ 474ft. lbs. torque
Last edited by BlackOmega; 01-12-2013 at 09:02 PM.