Mixing oils

Not open for further replies.
Jul 16, 2003
Palouse WA
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.

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.
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?
97 Toyota Tercell takes 2.7 qts of oil

+ the filter.
Why not go all out........ #1 Cost if all goes well next run will be all Mobil 1 for this car.

Yep. My 2001 nissan sentra 1.8L QG18DE takes just under 3qts as well
!! 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.
Do the UOAs for these engines running so few quarts show that they really beat up the oil?
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.
Not open for further replies.