10/40 semi synthetic January 2011

Has the noise been noticeable since shortly after this oil change? If so you could drain out what you have in there and purchase something good like a 5W40 fully synthetic from someone like Mobil, Millers, Fuchs, etc together with a genuine filter and see what it sounds like then.

I'll bore you for a few minutes, I had a similar experience with the Landcruiser i owned several years ago, i serviced it meself with a reputable make of oil commonly sold at accessory shops (still sold), about a thousand miles later it sounded like the ends were rumbling, a horrible expensive sounding clatter.

The excellent dealer (now gone more's the pity) at Collyweston then listened to it, the mechanic there built and overland rallied his own LC's so wasn't much he didn't know about them, he told me to drain out the rubbish (he used another term) that was in the sump and put some good stuff in...i did just that and that vehicle went on for many years sounding as sweet as the day it rolled off the line.

You could also find it's something more minor...

When my car had a new alternator a couple of years back, it came back with a worrying metallic rattle from the engine bay. After a few minutes of head scratching by the mechanic he found the source of the problem... the top engine mount had broken, and under light loads gave a nasty metal-on-metal noise in time with the engine. €35 later job done...