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 Oil Consumption Info in my '84 SR5

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PAguy

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Car : 1984 SR5 RWD 5 speed
Posts : 224
Join date : 2010-10-22
Age : 57
Location : Western Pennsylvania

PostSubject: Oil Consumption Info in my '84 SR5   Sun Sep 02, 2012 8:23 pm

Finished up my latest 1800 miles in the '84 SR5 - home to Atlanta to Nashville and back east of Pittsburgh. Turned 275K yesterday around Cinci.
I've run 10-30 synthetic with half a bottle of Lucas for a long time. My oil consumption was up around a quart every 1200 miles or so.
I didn't want to risk running dry on the 700 mile legs, so I put in 20-50W conventional with a full dose of Lucas. WOW, what a difference.
I used less than a pint on the whole 1800 miles, all 4 plugs dried up nice with a light grey dusting. And the oil pressure indicator, which has always run at the midway notch, now runs at the 3/4 notch. But I lost a couple of mpg's - surprising I got that much extra friction. I'll still do my valve stem seals some day and go back to synthetic. But for the time being, I can live with 35 on the highway, 30 in the country and no worries about adding all the time.
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suprastarr

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Car : 85 corolla
Posts : 599
Join date : 2011-02-24
Location : usa

PostSubject: Re: Oil Consumption Info in my '84 SR5   Mon Sep 03, 2012 4:51 am

I was told that synthetic oil was not good for older cars to run. I was told it deteriorates the oil seals
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BlackStar

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Posts : 312
Join date : 2011-12-19

PostSubject: Re: Oil Consumption Info in my '84 SR5   Mon Sep 03, 2012 1:39 pm

suprastarr wrote:
I was told that synthetic oil was not good for older cars to run. I was told it deteriorates the oil seals


interesting. On my car i just fully rebuilt the engine, and always figured carbs and synthetic oil just don't mix. But if it is the old seals that don't like synthetic, i may switch. However, my new transmission seals did leak out the synthetic fluid i put in the transmission.
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