Mixing oils

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I got blessed with changing the oil in my Girlfriends mothers car from now on and it takes 3 quarts of oil So I added 2 quarts of Mobil drive clean 5w-30 and 1 quart of Mobil 1 5w-30. What do you guys think? Am I crazy? Will do a UOA on it. Ken
 
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What you did certainly isn't crazy, but why not go 100% M1 and go longer oil change intervals? You plan to do a UOA anyway so you could safely monitor an extended interval.
 

Patman

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I'm surprised nobody else asked this yet but what kind of car only takes 3 quarts of oil? Is it one of those Chevy Sprints/Pontiac Fireflys/Suzuki Swifts with the 1.0L engine perhaps?
 

Ken42

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97 Toyota Tercell takes 2.7 qts of oil [I dont know] + the filter. Why not go all out........ #1 Cost if all goes well next run will be all Mobil 1 for this car. Ken
 

JTK

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Yep. My 2001 nissan sentra 1.8L QG18DE takes just under 3qts as well [Eek!] !! Just started running M1 10w-30 on it. Ken42- FWIW, I'm doing the same kind of mix on my 2002 isuzu rodeo 3.2L, 3qts mobil drive clean, 2qts M1, all 10w-30. Will do a UOA on this after awhile. Joel
 
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Do the UOAs for these engines running so few quarts show that they really beat up the oil?
 
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Do the math guys....these small engines have a better sump capacity/engine size ratio than the big V8......example above equals 1.6 qrts/ltr versus 1.05 qrts/ltr in an LS1 Shouldn't beat the oil at all. I guess the engineers had it all figured out. Rick
 
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