I have a 2000 Audi A4 1.8 turbo and I recently just had an oil change and my low pressure light randomly comes on. The oil level is right and the engine isn't making any noises. The light comes on after I drive for awhile and only stays on for a few seconds, I was told by the guy that did my change that it could be since I changed from conventional to synthetic the conventional sludges up a little since the synthetic cleans the engine out better and the sludge is clogging the sending unit and it could possibly clean itself out, is this true? Anything to be worried about?