Mixing oils

[Ken42]

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

 

[Al]

You'll be fine. M-1 should help the Drive clean considerably.

 

[pscholte]

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]

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]

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. Ken

 

[JTK]

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. Joel

 

[pscholte]

Do the UOAs for these engines running so few quarts show that they really beat up the oil?

 

[Last_Z]

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