I've recently serviced my car. I did it over two Sundays due to time constraints.
I did the spark plugs (and air filter) first because I changed the rocker cover gasket over a month ago and wanted to make sure evrything was still ok ie no plugs swimming in oil anymore. Everything ok so far and during the week up until the oil filter change all was well and good
Next I did the oil filter. I used the same 5-30 semi synthetic oil that I've always used and I also made sure I used the correct filter - a Halfords one.
However, now that I've changed the oil and oil filter the engine is really lumpy when I start it up from cold. It only lasts for 15 seconds max and then stops but it's really annoying as i was going to be selling the car later this month. There are no symptoms at all after that first 15 seconds. I took it down a dual carriageway this morning and it seemed to be perfect.
Additional information about this post:
1 - I'm not sure the oil filter (fitted by the garage for the previous service) I removed was even the right one as it was half the length of the new one and the one in the pictures of the how-to guide; yet I had no problems before. The new one is definitely the right one.
2 - I always use 5w-30 semi-synthetic oil conforming to the (long letters and numbers) standards code printed in the manual.
If anyone can suggest a diagnosis/fix I would really appreciate it.
Thanks guys.