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11-10-2025, 12:15 AM
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#1 |
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Senior Member
 
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 8,115
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Mixing Oils
My 2003 Tahoe w/4.8 V8 seems to be leaking oil. I had the oil changed in July and now I'm getting Oil Level Low on the odometer screen. A suspicious scum of an oil slick on my driveway, and I'm thousands of miles from Exxon Valdez...
I am out of my preferred lubricant, Valvoline 5W-30 High Mileage synthetic. [Or NAPA equivalent.] I have one qt bottle of Mobil 1 5W-20, I got from a neighbor. Is it OK to use this one quart of Mobil 1? No time to get to O'Reilly's in the morning before work.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 11-10-2025 at 12:20 AM. |
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11-10-2025, 12:20 AM
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#2 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 9,870
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Re: Mixing Oils
I have done it.
 I will not sponsor or stand behind it. 
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________________________________________________________________________________________ ____________________________________________ The early bird gets the worm, But the second mouse gets the cheese 85 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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11-10-2025, 12:23 AM
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#3 | |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 8,115
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Re: Mixing Oils
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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11-10-2025, 12:44 AM
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#4 | |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 9,870
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Re: Mixing Oils
Quote:
__________________
________________________________________________________________________________________ ____________________________________________ The early bird gets the worm, But the second mouse gets the cheese 85 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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11-10-2025, 12:50 AM
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#5 | |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 8,115
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Re: Mixing Oils
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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11-10-2025, 01:56 PM
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#6 |
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Registered User
Join Date: Jan 2017
Location: Valley, NE.
Posts: 1,064
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Re: Mixing Oils
I have done it in the past. Full of mixed oil is better than driving low in my opinion!
Greg
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________________ 1970 GMC Sierra Grande, 2500 133" wb, 402, 4spd. 2007 GMC 3500 SRW 4x4, Crew cab, Duramax/Allison. (Sold} 1987 Chevy Suburban 2500, Silverado, 2wd, 454, t-400 2023 Chevy Silverado LT 3500, crew cab, longbox, 4x4 Z-71 Duramax. |
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