oil disapearing 5.4
01-21-2015, 09:17 PM
#2
Senior Member
01-21-2015, 10:27 PM
#3
Junior Member
If you have an oil that has an extremely high NOACK rating, that would explain it. Granted, usually on most vehicles it is 1 quart per 5quarts of capacity in a 5k mileage avg. Depending on the oil, your climate, and driving style, this could very well equat to closer to 2+ quarts. Hot climate, high NOACK on the oil, spirited driving or lots of high loads on the engine would make for a bad combo.
Try pulling an oil sample and send off for a UOA to see if there's something going on there. If it is showing pretty thick for it's grade and wear metals are good, then it's from evaporation in a high stress and heat environment.
Typically a high NOACK means crappy base stocks. Whatever oil you use should have this number in their spec cut sheets. Be sure to math the spec sheet to the variant of bottle you have ( some older SM bottled oils vs the newer SN of the same exact oil could have different specs for example )
Usually high evaporation will show other issues after a lot of miles of this. A lower NOACK oil will help lower the amount of oil vapor leaving through your pcv.
Quote:
NOACK Volatility Test (ASTM d5800)
The NOACK Volatility Test determines the evaporation loss of lubricants in high-temperature service. According to the ASTM, “Evaporation may contribute to oil consumption in an engine and can lead to a change in the properties of an oil.”1 As with the TEOST test, low values in the NOACK Volatility Test are of particular benefit in modern, hot-running engines. In the NOACK test, a candidate oil is exposed to heat and circulating air. Following 60 minutes, the remaining oil volume is weighed and compared to the original weight, with the difference reported as the percentage of weight lost. Results must be limited to 15 percent or less to meet the API SN and ILSAC GF-5 specifications.
Try pulling an oil sample and send off for a UOA to see if there's something going on there. If it is showing pretty thick for it's grade and wear metals are good, then it's from evaporation in a high stress and heat environment.
Typically a high NOACK means crappy base stocks. Whatever oil you use should have this number in their spec cut sheets. Be sure to math the spec sheet to the variant of bottle you have ( some older SM bottled oils vs the newer SN of the same exact oil could have different specs for example )
Usually high evaporation will show other issues after a lot of miles of this. A lower NOACK oil will help lower the amount of oil vapor leaving through your pcv.
Quote:
NOACK Volatility Test (ASTM d5800)
The NOACK Volatility Test determines the evaporation loss of lubricants in high-temperature service. According to the ASTM, “Evaporation may contribute to oil consumption in an engine and can lead to a change in the properties of an oil.”1 As with the TEOST test, low values in the NOACK Volatility Test are of particular benefit in modern, hot-running engines. In the NOACK test, a candidate oil is exposed to heat and circulating air. Following 60 minutes, the remaining oil volume is weighed and compared to the original weight, with the difference reported as the percentage of weight lost. Results must be limited to 15 percent or less to meet the API SN and ILSAC GF-5 specifications.
01-22-2015, 10:19 AM
#4
Senior Member
Yah, I have a 2004 Lariat, 103K, same deal. I have tried Quaker State full synth, Valvoline full synth, Valvoline max life, same no matter what. Gotta be burning off somewhere I figure. I run it hard sometimes though, and don't always let it warm up before taking off in the morning. #timemanagementsucks
