Topped off my oil level with a quart of synthetic oil.

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My poor old tahoe

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I run conventional oil.

02 tahoe it running a 5.3 just north of 215,000 miles. She's an oil burner. 7, to 800 miles per quart.

Should I forget it, or change the oil?
 

wifes_truck

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don't mix conventional oil with synthetic. they need 2 different style filters. you could do damage.
 

wifes_truck

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ya i stand corrected i just read that.... sorry my wrong steerage all these years
 
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My poor old tahoe

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Thanks guys. Appreciate your well reasoned comments. I checked and discovered I'm nearly 11 months into this oil change so maybe it's time for an LOF
.. I usually get a few more miles down the road before I need to add a quart of oil right after an oil change. Closer to a thousand miles per quart as compared to the 700 per quart I'm getting now. And that's being generous.

We did a tranny service last month and boy what a difference. She shifts as good as new, now. Never had a more positive outcome on a trans service this late in the game. Remarkable, really.
 

Wylie_Tahoe

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If I need a quick top-off and im out of the "normal" oil, ill pour in what I got. No worries about it.

So it uses a qrt every 700-800 miles? Do you do a lot of hiway miles? My around town consumption is MUCH less then when im doing 65-70 for extended periods. Like almost no consumption compared to 1/4 qrt after a 300 miles hiway trip.
 
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My poor old tahoe

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If I need a quick top-off and im out of the "normal" oil, ill pour in what I got. No worries about it.

So it uses a qrt every 700-800 miles? Do you do a lot of hiway miles? My around town consumption is MUCH less then when im doing 65-70 for extended periods. Like almost no consumption compared to 1/4 qrt after a 300 miles hiway trip.
You know, you could be right. I drive all in town miles with almost no highway miles. Last summer I drove 245 miles, all highway, with my cruise set at 85 mph. A friend was in need of a ride to a family members funeral. We left late and that's why we drove so fast. I burned a half a quart of oil on that one 245 mile stretch and got 15 and a half mpg.. On the way back driving 65 mph I burned no additional oil and got 18 mpg.
 

Jimmyy

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Would adding a catch can do anything for this situation? I’m guessing the oil is going out the tailpipe rather then on the ground. Oil for high mileage help?
 

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