mixing oil

will it hurt to mix these 2? i just dumped 5 quarts of the one on right and need about a half quart more.

 

Not at all.

 

thanks! this helps too:

https://www.mobiloil.com/USA-Englis...arm_Mixing_Different_Mobil_1_Viscosities.aspx

 

and these are the same weight

 

In fact, motor oils can be almost universally mixed, including synthetics and standard oils (that's how they get synthetic blends). Different weight oils can also be mixed, resulting in a viscosity somewhere between the two depending on how much of each is added.

www.bobistheoilguy.com is an excellent reference for just about any question having to do with lubrication (of vehicles).

 

...you can never be too careful with what type of fluids you pour into Ms. Taco. gotta keep her clean and free of the nasties. She's getting a wash and wax in an hour or so.

 

They are probably the same stuff. They just charge you more for the yellow label. Sometimes it's had to find the yellow label.

 

Yep, you can mix weights, brands, types, it's all oil. Once it's in the pan it will mix just fine.

 

I don't know about all that, first off synthetic isn't petroleum based, its all chemical & with that each synthetic oil manu. has their own little recipe of chemicals for their product, & with that again it's NEVER a good idea mixing chemicals randomly, doing so you may actually create a reaction that turns out to be a corrosive agent (like an acid), it's not going to be an issue being half a quart low temporarily until you get the right synthetic to top off what you have in it now, regardless of what Oily Bob or Bob the oil guy says, just my $.02

 

You go DOuggersnot

 

i dont even bother with the extra half quart

 

All synthetic oils are derived from a base stock which is generally a petroleum or mineral oil distillate, depending on the grade of the base stock. API Grade 1-3 base stocks are mineral oils, Grade 4 is a crude oil distillate called PAO, Grade 5 includes pretty much everything else (silicone, esters, etc). There is a Grade 6 that is a fully synthetic base stock, but is not recognized by the API in the US, so you probably won't see those around very much.

Most big name synthetic oils (Castro, Valvoline, Pennzoil, etc) are from Grades 1-3. Mobil 1 claims to be Grade 4, but independent testing indicates it is Grade 3 as well. I think Royal Purple uses a Grade 5 base stock, too lazy to look it up right now (probably why it's so expensive).

Long story short, they're all made of the same stuff - synthetics can be blended with conventional oils without creating any undesirable compounds.

 

I've been told by multiple mechanics to never mix oil viscosities.

The few bucks>not being a cheap ass= piece of mind.

 

? Why not this way you can get the exact viscosity you want?

 

Higher grade = better oil?

 

Go ahead. Nobody's stopping you.

 

My question is why did the mechanic say this was bad to do?

 

sorry that i started a debate amongst other enthusiasts. i asked a question and it has been resolved (well, i think). mobil1 is mobil1 and 5w30 is 5w30, cant be much diff. between the extended performance and the reg. stuff, just thought i would ask. thanks for the insight fellas, good stuff.

 

From reading between the lines in the non-answer below, I would guess that there is little real difference between Mobil 1 regular and extended performance but the price. Rarely or perhaps even never will the company have to pay off on its "guarantee" and in the meantime it gets to sell the "better" oil for a premium price.

http://www.mobiloil.com/USA-English...nce_Mobil_1_Mobil_1_Extended_Performance.aspx

 

Didn't ask. Got a big "NO" three times. It's their profession, not mine. And I trust their experience then to follow some nameless face on da interwebz.