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Search Auto Parts Search 98 GMC may have sludge Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting christalcat New User Mar 8, 2009, 5:07 AM Post #1 of 4 (1311 views) 98 GMC may have sludge Sign In I have a 98 GMC 3500 7.4 L which I use as a canteen truck oil is changed every 3000 miles although I may have gone over a few times recently I have been hearing a clicking noise but not all the time how worried should I be ? what can be done ? I have had issues with poor coolant circulation and apparent evaporation of coolant in the cap radiator and heater core are less than 1 year old but there appears to be gunk in the radiator thanks for your help!! Tom Greenleaf Ultimate Carjunky / Moderator Mar 8, 2009, 5:29 AM Post #2 of 4 (1310 views) Re: 98 GMC may have sludge Sign In The type use - perhaps low mile, lots of idling and short trip may be stressing your oil and I suggest changing more often and using synthetics. Cooling system: These came with Dexcool when new that didn't turn out so well in hindsight. What kind of goo are you noticing now? If just at the radiator cap - clean it and see what returns if anything. I suggest if on Dexcool now even just a year out changing to regular non color differentiated extended life coolant - properly mixed AFTER a good flush (whole cooling system) again. Heater performance can be a good clue as to gunk build up. It it's fading it may be catching debris/goo that just might mostly flush out, T christalcat New User Mar 8, 2009, 5:35 AM Post #3 of 4 (1308 views) Re: 98 GMC may have sludge Sign In Thank you Tom for your reply. By the way this truck has 145000 miles. Do you think that by changing the oil more often that will make the clicking / sludge problem go away? thanks again Tom Greenleaf Ultimate Carjunky / Moderator Mar 8, 2009, 5:50 AM Post #4 of 4 (1303 views) Re: 98 GMC may have sludge Sign In Pay attention to the clicking. I don't know what is causing it and it may not be an oil issue at all - can't say from here. For oil sludge detection - pulling a valve cover is a giveaway as to how well it's doing with the current routine of changes and oil type used. Dipstick may show something or sometimes underside of an oil fill cap gives some clues. Sludge in oil slowly builds and items needing it slowly get less and sometimes real local friction heat will make oil sticky like a varnish. Plain oil changing can reverse that to some degree. Additives are in new oil and I shy away from magic tricks for that - keeping in mind we don't know this is an issue at all! The reason for suggesting synthetics as they plain tolerate heat better than conventionals so the chance of sludge is reduced. If ticking noise is better or worse when cold or warm it may be solved with choosing different oil and changes - again can't say for sure. If you are worried enough about the noise please do have it diagnosed in person and pick a plan from there, T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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