TooPhat

My ol Lex has had this tapping noise eversince I bought it which I know is common in the higher milage V8's. I'm 99%sure it's the valves as you can hear them very well towards the back of the engine on both sides. I read once that there is a fluid you can put in your oil which will make the sound decrease for a bit depending on the severity. ANyone know what type of fluid this is?

Along with that there is a much louder ticking under acceleration and sounds to be coming from under the car upon closer inspection. Exhaust manifold gasket perhaps??

TooPhat

bump

Strida

What type of oil do you use?

TooPhat

5w30...should I try 10w30??

Strida

Yes, try using 10w30. I would have suggest 10w40 or 15w50 but since its freaking cold already, use Mobil 1 10w30. Its not the ultimate solution but it will help for now. Caution though since you have a high mileage car you might develope an oil leak. If you do, try mixing it with 10w30 coventional oil and synthetic. But i have been using it for years now and never had any oil leaks from my cars including my 370,000 km 1991 nissan sentra

In my 300zx I had that tapping and ticking sound, so I used Mobil 1 15w50 in the summer and never heard of the sound again.

TooPhat

merci beaucoup. I will try that asap. I might try just regular 10w30 forst......I had the bad leaky problem with changing to synthetic in a previous car with high milage....but I might give it a shot

retrodrive

http://www.cureline.net/lex/howtos/i...ing_engine.htm