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1

Omega General Help / Noisy hydraulic lifters (part2)

« on: 28 November 2008, 22:01:59 »

Hi Gang,
Many thanks for the help/ replies on the last post. The general concensus was probably blocked or partially blocked oilways causing the lifters to "rattle" for the first few seconds on startup from cold. And several oil changes was one of the answers.
Would it be a prudent move to go thinner or thicker on viscosity on the oil (even if for just short term). And also what are your thoughts on adding an additive such as slick 50, wynns stp, or even neat diesel as someone suggested, or anything else? Thanks in advance,
and kind regards,
Andy.

2

Omega General Help / Noisy hydraulic lifters

« on: 22 November 2008, 23:21:03 »

Hey gang, i am a newbie and after a bit of advice. I have an Omega with the 2.5 BMW diesel engine. It is just coming up to 100K (nicely run in). I was running it on fully synthetic engine oil, and 50/50 on diesel and bio fuel. No problems for about 10K. Then on a cold morning, it developed a heavy "rattle" on startup from cold for about 5 seconds, and would be noisy until fully warm. After being stood for a while it would "rattle" for a couple of seconds. It sounded very much top end, and i guessed it would either be the lifters or fuel pump.
I went back on to straight diesel, and changed the oil back to semi-synthetic. This has improved things by around 70% but it still has the rattle from cold. The oil change has made the difference (i think).
Can anyone throw any light on this, is it common?
Many thanks in advance.
Regards,
Andy.