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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / March 2006Humorous GM TSB
I just ran across this oil consumption TSB from 2003 -- Bulletin # 01-06-01-011A. My favorite part (besides the fact that they play off internal oil consumption as normal on new cars) is the following paragraph telling mechanics how to check oil. 20 minute wait if you are checking a 3.4!!! WTF? _______________________________________________________ Not Waiting Long Enough After Running Engine to Check Oil Level The vehicle should be allowed to sit for at least 5 minutes (20 minutes for the 3.4 L LQ1), after the engine has been shut off, before taking an oil level reading to assure the oil has had enough time to drain back into the crankcase. In order to ensure accurate results, the temperature of the oil should be close to the same temperature as the last time the oil level was checked. ________________________________________________________ Hell, in 20 minutes your oil level would probably be *higher* on a 3.4 from the likely internal coolant leakage. Toyota MDT in MO > The vehicle should be allowed to sit for at least 5 minutes (20 minutes > for the 3.4 L LQ1), after the engine has been shut off, before taking > > Hell, in 20 minutes your oil level would probably be *higher* on a 3.4 > from the likely internal coolant leakage. The LQ1 is the 3.4L DOHC, not the 3.4L pushrod coolant leaker. > > The vehicle should be allowed to sit for at least 5 minutes (20 minutes > > for the 3.4 L LQ1), after the engine has been shut off, before taking [quoted text clipped - 3 lines] > > The LQ1 is the 3.4L DOHC, not the 3.4L pushrod coolant leaker. Sorry, my GM code comprehension is near nil RE: "LQ1". Ah yes, the monsterous (in physical size) DOHC. So, what's the deal with the oil drainback time on that beast?! Toyota MDT in MO >> > The vehicle should be allowed to sit for at least 5 minutes (20 minutes >> > for the 3.4 L LQ1), after the engine has been shut off, before taking [quoted text clipped - 8 lines] > Ah yes, the monsterous (in physical size) DOHC. So, what's the deal > with the oil drainback time on that beast?! My guess is the amount of oil passages and maybe the 24 hydraulic lifters. The TSB may say 20 minutes, but I've never seen it take that long. Usually just a minute or two is fine, but maybe they just want to be sure. Then again who knows. One thing I have noticed is when I pour oil into the engine, it runs directly over the dipstick. Maybe the wait time is there to ensure there is no oil dripping onto the dipstick when you are checking it. If there is oil dripping, this could give a false reading of adequate oil when in fact there is not. But really though, I don't know. Steve > One thing I have noticed is when I pour oil into the > engine, it runs directly over the dipstick... > ...this could give a false reading of > adequate oil when in fact there is not. I have noticed that unpleasant phenomenon creep into newer cars since the mid 90s. Certain newer Toyotas suffer from it as well as many domestics I've seen. It POs me to wait so long to check oil. It's not a problem when you know how much the engine holds, but for the indie tech that sees every different make under the sun it must be frustrating. I can't figure out why this design is becoming more prevalent. Thanks for the info, Toyota MDT in MO >I just ran across this oil consumption TSB from 2003 -- Bulletin # >01-06-01-011A. My favorite part (besides the fact that they play off [quoted text clipped - 17 lines] > >Toyota MDT in MO If it takes 20 minutes or even 5 min for oil to drain back to the pan, I would say the SOB has an oil circulation problem to go along with any oil consumption problem. If it is at operating temp, you should be able to get a reasonable level check in under a minute. Lugnut >>I just ran across this oil consumption TSB from 2003 -- Bulletin # >>01-06-01-011A. My favorite part (besides the fact that they play off [quoted text clipped - 26 lines] > > Lugnut lol... would it even be safe to drive that car if the engine was that slow to return oil to the crankcase? wouldn't you start pumping air eventually and/or the valve covers would start leaking out the pcv or something? At least the valve springs would run cool being totally submerged... > I just ran across this oil consumption TSB from 2003 -- Bulletin # > 01-06-01-011A. My favorite part (besides the fact that they play off > internal oil consumption as normal on new cars) is the following > paragraph telling mechanics how to check oil. 20 minute wait if you > are checking a 3.4!!! WTF? GM has another engine that suffers from incorrect oil levels and checking procedures....the Northstar engine. If you check it cold as opposed to hot, you will always overfill the engine. It also takes a while to drain down. It's actually best to slightly underfill this engine.....it has a capacity around 7.5 liters, so a liter here and there doesn't make much difference. Well, a liter over does, but not a liter under. Ian > > I just ran across this oil consumption TSB from 2003 -- Bulletin # > > 01-06-01-011A. My favorite part (besides the fact that they play off [quoted text clipped - 11 lines] > > Ian I freaked the first time I filled one of those - back in my indie days. Add some oil, wait -- check it -- too low. Add some oil, wait -- check it -- too low. Add some oil, wait -- check it -- too low. Add some oil, wait -- check it -- D'oh! Too full! Toyota MDT in MO
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