Recently I had my 2005 Forenza water pump and time belt replaced. Tensioner and idle pulley were also replaced.
Also replaced a leaking radiator and at the same time replaced both coolant hoses. The same shop repair changed cylinder head gasket and had the head machined for any warp, if some there. He also changed oil and oil filter. I don't know what grade of oil he used but it was a very thin oil, like 5w30.
I was called to pickup the car and just after turning the engine on I noticed a very rough idle causing the entire car to vibrate. I drove the car around the city, couple blocks and it appeared it was OK, except the rough idle and a noise similar from knocking valve.
I then took it to a highway and for about 20 miles with A/C on driving at around 60 - 70 mph. As the day was hot A/C was blowing at the maximum and cooling very well. I got off of the highway and almost reaching my destination in a local street the engine light came on and just after the oil light also came on and then started blinking. I then stopped the car and then the engine turned of by itself with a loud knocking noise similar from the knocking valve.
This car never had any engine problem before. Car has 106 K miles.
Tacking the dipstick of the engine it was showing oil at the minimum level but didn't found any oil leakage.
I then added some 10w40 oil and after 30 mins try to start the engine on again but the engine oil came on again. As it was 10:40PM the mechanic shop was closed I towed the car to the shop and talked to mechanic on the day after. In the day after mechanic said that the car was running fine with no oil light on and engine running fine. He told me that I add too much oil and he had to drain what I added. "Other than that" he said the car is fine.
"The only bad thing that you have and the reason of the rough idle, oil light" he said "is your bad battery You should replace your battery" he said.
Battery store found the battery not much good and had it replaced for a new one.
After taken care of this I took the car again to the highway and after driving for around 10 miles in a hot weather, had the same problem: rough idle and oil engine on. Immediately after that I brought the car back to the shop when he said that now the only reason for that noise and the oil light can be the valve lifters. Now he wants to change the lifters but I told him to wait while I search more about this issue because it seems like that he does not know about what is going on.
I read a similar article on this forum posted by " mace760" on February 2015
where talks about a similar problem and the oil thickness was the problem.
As I said before, this car has 106 K miles and never had engine problems before. It is the first problem and just after leaving the mechanic shop.
One thing I know:the mechanic is a kind of lost and I paid him $ 1450.00 labor only.
Please, I need some help to get this car back in busyness because I use as my commute to work and the weather here in Texas is very very hot.
After getting this issued resolved I will post the about the findings.