I wanted to change my oil and had 2 quarts of 10w30 and 1.7 quarts of 15w40. I mixed them and changed my oil with that. I guess the weight would be 12w34. I also changed the filter.

I live in Idaho. Do you think I will be ok or is this a huge mistake? I have an xa 2005 with 92,000 miles.

 

Drain and start over i won't do that

 

I am inclined to think that it will be fine...

 

you'll be fine.

 

You will be fine. But i'd still recommend running 5-30 unless you have turbo.

 

You're not supposed to mix different weights.

 

Owners Manual says 5W30 , use only 5W30 unless you have nothing else available but to replace with 5W30 asap.

And there is nothing wrong with mixing different weights , go check out Bob Is the Oil Guy web site if you are unsure.

I personally would change for the correct owners manual called for oil ,
A heavier weight oil could increase oil pressure to the point of causing problems ( leaking seals ).

And our cars take 4 qts. not 3.7

 

i wouldnt worry too much about it. only time to be concerned is mixing syn and regular

 

15w40 is more geared toward diesels....its really thick...engine may not start over lol


probably will start and work but the engine may struggle. May not notice it except in MPG

 

You'll be fine.

I've got 210k on mine.

I ran oem oil for 2000 miles, mobile one synthetic 10w30 for 120k miles, royal purple for 900 miles, a change or two of rotella 5w40, 3.5 quarts of castrol edge and a bottle of Lucas additive from then to now. I usually do 10k drain intervals. Typically every 30k or so I will do a 500 mile oil change with something nonsynthetic just to flush particulate, my new favorite for flush has to be vr1 in 20w50. Yes, your box can run 20w50 with no blown seals or loss of compression.

Get some castrol edge in there in a 5w30 with a purolator filter though.

For conventional oils, rotella is Among the best... Close second behind vr1 for me.

 

Ps, everyone talking about these oils need to realize how minimal that change in viscosity really is. I wouldn't run it below 30 degrees, but at operating temperature your motor won't know the difference. Your lubrication system deals with massive changes in viscosity on a daily basis.