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LS1 Oil Consumption on long distance trips

This is a discussion on LS1 Oil Consumption on long distance trips within the General Help forums, part of the LSx Technical Help Section category; Oil consumption noticeable on long distance cruising. Seems to be very little oil consumption around town - 3,000 miles between ...

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    LS1 Oil Consumption on long distance trips

    Oil consumption noticeable on long distance cruising. Seems to be very little oil consumption around town - 3,000 miles between oil changes without town, seems to be very little oil consumption. Once I get it out on the highway, I can burn through a quart in a 1,000 miles ... also discolored.

    Engine rebuilt and stroked to 383 about 18,000 miles ago, mid 20's cam, 3.73 diff gears, Yank PE3400, strengthened auto and trans cooler etc.

    Any insight would be appreciated.

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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    PCV Valve Catch can??

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    Quote Originally Posted by JoshieDoom View Post
    PCV Valve Catch can??
    Catch Can going on in a few weeks time. Don't understand why this is happening though. Seems like the wrong way around. No oil used around town with occasional spirited driving but cruising at just over 70 mph seems to just eat the stuff.

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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Maybe because you have more crankcase pressure and its spitting it out?? just an idea

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    Long long story made very short, and hope it makes sense, cause I'm late for work..sorry. I read that driving around town, and lets say that you have about 1500 miles on your oil since the last change, you check it, the levels fine, maybe a little low. Then you go on a road trip, and you travel a hundred miles, pull over to get something to eat, check the oil and all of a sudden WHOA!!! Down a quart! In 100 miles! (Just throwing out numbers you understand) Why the big drop all of a sudden? All that around town driving was ADDING all kinds of contaminents to your oil..i.e. water, gas, so on, that was giving you a FALSE reading on the dipstick. When you got her on the highway, and got her up to speed for a while, it actually burned off these contaminents, and then you got a TRUE reading!
    Giving you the impresswion that your car was burning oil, but she was actually just burning off the crap that all our cars have in the oil. One of the reasons you see manufacters recommend that if you take nothing but short trips, you change the oil more often, that stuff doesn't get burned off.
    Hopefully that made some sense...gotta go..........

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    79 T/A -91 Firebird
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    I totally forgot about that..the PCV valve is supposed to reroute a lot of the gunk into the combustion chamber to burn it and exit the crankcase.

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