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[Johnny English]

Hi all!
My iron is 500 km after oil change but since that I can still hear strange noise from camshafts (valve voice) and crankcase . Previous owner used Castrol 10w40 and I've decided the change for recommended GM oil. Is it possible that's existing faked GM 10w40 semi-synthetic?  OR is Castrol Magnatec better? I'm reluctant believing in. Any special act has to be done at time of change of different oil type? The noise is not strong but scaring me  especially at low rev (idle) hearable well. Pump doesn't push enough at low rev? What do you propose?

Many thanks,   Laszlo , Hungary

[duggs]

From what I recall, reading here for nearly 3 years now, Castrol is NOT recommended for Omega engines.

Swap to GM as soon as you can.

[Abiton]

From what I recall, reading here for nearly 3 years now, Castrol is NOT recommended for Omega engines.

Swap to GM as soon as you can.

He has.  Now it's noisier. 

[tunnie]

What engine, what year?

[Johnny English]

Yep, that's why I've already changed and my problem began there... I use GM Genuine 10w40 semi-synthetic but this noise never been till oil changing... is there any act I missed between using of two kind of oil? Cleaning or anything...   My car 95 reg x25xe saloon model. Cheers.

[tunnie]

I'd do some quick changes, change the oil every 500 miles or so for the next 2,000, see if it reduces 

[Johnny English]

My mechanic recommended using of inside cleaner additives. Does GM have any? Do you have any experience with similar additives?

[albitz]

Use wynns lifter treatment in your next oil change,then after 1000kms change oil,then do another oil change after 1000km and maybe another. If it is still the same you either learn to live with the noise or remove camshafts and service or change the lifters.

[albitz]

http://www.ebay.co.uk/sch/items/__wynns+lifter_W0QQ_dmdZ2?rvr_id=271903363792&clk_rvr_id=271903363792&crlp=8528794041_228459_228459&UA=%3F*I8&GUID=de5f6de61320a0aa15327962fffdf456&agid=2116242921&tm_kw=wynns+lifter&siteid=3&MT_ID=12&tt_encode=raw&keyword=wynns+lifter&geo_id=21&ff4=228459_228459

 

[Sehen]

Had the same problem on my 95 Estate. Noisy lifters after 1'st oil change, just a week after i bougth it, at 105K.miles
Used wynns oil system cleaner, then canged the oil with GM 10/40 semi, and topped it of with Wynns lifter treatment.
After a few hundred miles, the nois where gone, and it stayed away all the way to 250K miles when the piston rings gave up on number 2 syl.
But I did change the oil every 5000 miles, or twice a year..

Give it a try, but only use wynns as the guys have recomended.

[Johnny English]

OK, I'm gonna do!
You are kings, guys, thanks for all! 

[Stallion]

sorry to hijack op? but was thinking thought its not wise to use them engine cleaners on old engines, if there is any clogged up cracks then this clears and you'll end up with oil leaking. Has this got any weight to it, or utter porkies!!

[Johnny English]

My one just seem to be old, before I bought the car got younger engine. The 2th owner  before me did and the previous one put into that wrong oil. I investigated (fortunately there are a lot of Omega fanatic here so, hm,  that was not a hard job) The  only original part is the HG but it's restored as well.  I'm not afraid of cracks. 

Cheers

[albitz]

Wouldnt recommend engine flush,just use lifter treatment.

[Johnny English]

OK, I've already found a source here. Not a huge amount of money per bottle.