mixing oils?

[huxley7]

I mixed 5 quarts of napa 5w-300 with one quart of penn. 10w-40 will this hurt my 1991 dodge monaco 3.0 engine?

 

[Patman]

Yes, that 5w300 oil is too thick! Seriously, you'll be fine. Why mix though? If you want a slightly thicker oil, go with one of the high mileage 5w30s out there, they are all close to 40wt oils.

 

[3 Mad Ponchos]

Mix -n- match all you want, as long as the oils you use are acceptable for that engine. I had a beater truck for a few years that I gave it all my leftovers. It never seemed to care. Cheers, 3MP

 

[Cutehumor]

hey patman I've been putting pennzoil high mileage 5w30 in a 96 pontiac sunfire 2.2 liter engine with 92k miles on it. It's burning the pennzoil high mileage 5w30 at a quart every 1200 miles. the engine calls for 5w30. Since the weight is almost a 40wt, any problems going to 10w40 high mileage even? I want to go thicker since summer is coming.

 

[Patman]

quote:

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Originally posted by Cutehumor: hey patman I've been putting pennzoil high mileage 5w30 in a 96 pontiac sunfire 2.2 liter engine with 92k miles on it. It's burning the pennzoil high mileage 5w30 at a quart every 1200 miles. the engine calls for 5w30. Since the weight is almost a 40wt, any problems going to 10w40 high mileage even? I want to go thicker since summer is coming.

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Why do you want to go even thicker? Just because of the oil burning? A thicker oil might slow down the rate of consumption, but it also might increase engine wear also, as I don't believe your engine needs a 40wt oil. But without seeing oil analysis results, neither of us really knows for sure.

 

[turbochem]

quote:

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Yes, that 5w300 oil is too thick!

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Whoa .....and I thought we were headed the other direction....... Don't worry, 1MPG is fine......screw CAFE!! Typos....