Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: andybob on 22 November 2008, 23:21:03
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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. :D
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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. :D
had this on my petrol, answer was oil change, and more oil changes, yours is a Diesel so not sure the answer is the same for you :-/
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Firstly, do a few short intervial oil changes with 10/40 oil. No need for any better.
Secondly, unlike Pugs, the Omega TD does not run too well on veggie derivatives. Keep some decent diesel coming through there for a bit, with no funny fuels... It could well be a diesel knock.
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pump knock when cold is very common with diesels. my old 1994 2.5td did it for first couple of minutes every morning and its been like it since 1998 when first purchased by my dad, and the engine has done over 350000miles and lives on in another car somewhere now.
oil and fuel filter changed every 3000 miles and air filter at least every year, was run on ashford 15/40 and later in life mobil semisynthetic10/40