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1996 Z-71 loses oil pressure Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting D&K212 New User Feb 7, 2009, 10:27 AM Post #1 of 4 (1198 views) 1996 Z-71 loses oil pressure Sign In We just recently purchased a 1996 Z-71.The truck has about 170,000 miles on it.The oil pressure was fine the first week we had it.We had the oil changed(i believe it has castrol (10w-40) and i noticed it started fluctuating a little.We took the truck off roading and since then when you start the engine it has 40-50 lbs pressure.Then as the truck comes up to temp the oil pressure will drop almost to "0".Any advice would be greatly appreciated. Tom Greenleaf Ultimate Carjunky / Moderator Feb 7, 2009, 10:57 AM Post #2 of 4 (1196 views) Re: 1996 Z-71 loses oil pressure Sign In Seriouly low oil pressure can be caused by very worn engine bearing and could be covered up some with VERY thick oils. A decent engine should be ok with 10-40. Pressure must be checked with a tester not just the vehicle's gauge! Anything unusual happen with this off road venture? Oil is full isn't it? Any underside damage, leaks, funny noises? It oil too full now by any chance? Could be flooded with gas which would way overthin oil with just a small amount. If you hear classic engine knock from low oil pressure I wouldn't even run this till checked out further, T D&K212 New User Feb 7, 2009, 11:09 AM Post #3 of 4 (1194 views) Re: 1996 Z-71 loses oil pressure Sign In Nothing unusual happened as far as leaks and noises and it was full of oil before we left.I did drain the oil last night and it was almost like water,but not thinking i didnt even check the oil level before draining.I havent heard any knocking.As the pressure starts to drop i shut it off.Due you think a 20w-50 and a bottle of lucas could cure this without major cost? Tom Greenleaf Ultimate Carjunky / Moderator Feb 7, 2009, 11:24 AM Post #4 of 4 (1190 views) Re: 1996 Z-71 loses oil pressure Sign In Need to know about the old oil. Hope you have some. I was thinking fuel from very leaky injectors or something diluted the oil and that will seriously limit it's viscosity and lubrication ability. Old oil would smell of gas. If so - that needs to be fixed at once and you might be ok. Oil treatments can only temporarily raise viscosity if fuel is still getting in. If level goes too full that alone can damage the engine. If just worn using 20-50 (if temperatures allow) would help buy some time and you might see the warmed up pressure increase to something adequate for a time. More: If you only saw the low oil pressure while off roading and vehicle was at a VERY high angle it's possible the oil in pan was so sloghed to one end or side the sump pick up couldn't pick any or much up! Just don't allow it to run with that low pressure or it will (if true pressure) wipe out what's left of the engine in short order, T   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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