1998 Chevy Express hydraulic lifters

COASTIESTEVE

MEMBER
1998 CHEVROLET EXPRESS

Noises problem
1998 Chevy Express V8 Two Wheel Drive Automatic

I bought my Chevy Express this year. Within the first few days, I noticed a tapping noise from the engine. When the engine is hot, and at idle, I hear the tapping. When the engine is cold or hot during driving, I don't hear the tapping. I live in Florida which has very hot summers, and this winter has been cold and I have not heard the noise at all. I think with the hot weather coming, the noise will return. I have been told by several mechanics that I have hydraulic lifters and that they are not adjustable to reduce this noise. They suggested I change oil every 500 miles for 3-4 times to clean out sludge and use an oil thickening agent like Lucas Oil Additive to keep the viscosity of the oil high. The recommended oil for my engine is W5-30 which I always use. The tapping is by no means loud, it is more annoying. Should I be concerned, and how should I correct the problem if that is the solution?

1 Reply

HMAC300

MECHANIC
48,601 POSTS

If it truly is lifter noise the only thing I used to use isn't available any longer. But you could use 1 quart of transfluid for about a thousand mmiles and then change to maybe 10w30 oil instead of 5w. It could be piston knock or slap which doesn't really hurt anything. The oil additives don't do a heck of a alot although some people swear by them.