About a month ago or so, I purchased a 99 Taurus with 78K miles for $1100. Car looks fine, in general things are fine except for......
There is a LOUD lifter noise in the engine and yes, I knew the problem when I purchased the car. But the funny thing is that doing an oil change quietes the engine for about 700 or so miles. By that I mean when I start the engine in the mornings, it is not noisy until I get some miles on the oil. After getting some miles on teh oil, it takes a few minutes for the engine to sound normal.
The when the engine is started in the morning it gets loud after the 500+ miles on the oil change but after a minute or so it quiets down. I even had a check engine fault for misfire. That fault occurred twice and each time it cleared.
I took the car to my favorite shop. I wanted info on replacing the lifter but what I got instead was an additive, something named 50+ for high mileage engines if I remember right. His advice was the lifter was draining because of carbon and this magic potent would help clear away anything that allowed the lifter to drain. Heck, I even purchased another bottle of the stuff from him. Anyway, after about 500+ miles or so, the engine started rattling and shaking when started in the mornings. After a couple of minutes, things get back to normal.
So I drained the oil and filled it with Napa straigt 40 and his bottle of magic CACA. Sure enough, started the car and it ran GREAT.............FOR ANOTHER 500+ miles. Then back the the loud lifter noise after the car sat overnight.
Today I drained the Napa 40 with less than 1000 miles on it and put in big bucks BRAD PENN 20-50 racing oil, the green stuff along with a new filter. Started the car and after the oil circulated, the engine sounded fine although there was a very slight tappet noise.
WHAT THE HECK IS GOING ON??? Oil should last longer than 500-1000 miles. The only thing I can think of is the could be a lot of sludge in the engine. If I have to I will pay to have the lifter replaced and hope the cam is not damaged.
If the lifter is draining overnight, why does it only drain when the oil has some miles on it?
Anyway, thats my latest problem.